Version 7.9, October 2020 Improve Racket CS place-local allocation, add parallel GC, and merge Chez Scheme GC support for incremental promotion Change stack traces to suppress built-in functions Use XDG filesystem conventions by default on Unix Bug repairs and other changes noted in the documentation Version 7.8, July 2020 Add unboxed flonum arithmetic to Racket CS Add Racket CS improved GC accounting and 'incremental mode Add Racket CS AArch32 and AArch64 support, including places/futures (which are not available in BC) Bug repairs and other changes noted in the documentation Version 7.7, April 2020 Add support for embedding Racket CS in other applications Switch Racket CS immutable hash table to HAMTs, based on stencil vectors in the Chez Scheme Bug repairs and other changes noted in the documentation Version 7.6, January 2019 Bug repairs and other changes noted in the documentation Version 7.5, November 2019 Re-license Racket code as well as most C code under a permissive license; see LICENSE for more details Bug repairs and other changes noted in the documentation Version 7.4, July 2019 Disabled single-flonum reading by default and added `read-single-flonum` and `single-flonum-available?` Bug repairs and other changes noted in the documentation Version 7.3, May 2019 Bug repairs and other changes noted in the documentation Version 7.2, January 2019 Bug repairs and other changes noted in the documentation Version 7.1, October 2018 Added sha1-bytes, sha224-bytes, and sha256-bytes Bug repairs and other changes noted in the documentation Version 7.0, July 2018 Replace the macro expander with a new, Racket-implemented expander Add an initial implementation of Racket on Chez Scheme (in the source distribution) Bug repairs and other changes noted in the documentation Version 6.12, January 2018 Bug repairs and other changes noted in the documentation Version 6.11, October 2017 Bug repairs and other changes noted in the documentation Version 6.10, July 2017 Extract OS adapters to the "rktio" library Bug repairs and other changes noted in the documentation Version 6.9, April 2017 Bug repairs and other changes noted in the documentation Version 6.8, January 2017 Bug repairs and other changes noted in the documentation Version 6.7, October 2016 Bug repairs and other changes noted in the documentation Version 6.6, July 2016 Bug repairs and other changes noted in the documentation Version 6.5, April 2016 Bug repairs and other changes noted in the documentation Version 6.4, January 2016 Changes noted in the documentation, including support for incremental garbage collection Performance improvements and bug repairs Version 6.3, October 2015 Bug repairs and other changes noted in the documentation, including substantial changes to the macro expander Version 6.2, April 2015 Bug repairs and other changes noted in the documentation Version 6.1.1, October 2014 Bug repairs and other changes noted in the documentation Version 6.1, July 2014 Changed use-before-definition to be an error instead of producing an # value Removed the mzlib/class100 library Version 6.0.1, April 2014 Moved detailed-change recording to documentation Version 6.0, January 2014 Packages & collections: ---------- Reorganized collections into packages Added 'config-dir mode for find-system-path Added PLTCONFIGDIR environment variable and -G/--config flag Removed -C/--links command-line flag Added links-file and links-search-dirs to config, enabling a search path of installation-wide link files, as well as pkgs-dir and pkgs-search-dirs Changed link-file handling to separate "user" and "shared" modes; removed 'links-file mode for find-system-path, PLTLINKSFILE environment variable, and -C command-line argument Removed "shared" links and package scope Add current-library-collection-links, find-library-collection-links Changed module search to use current-library-collection-paths before collection link files by default Changed use-user-specific-search-paths and use-collection-link-paths to affect only find-library-collection-paths and find-library-collection-links Added "share" directory, moved "pkgs" there Base user directoy paths on an installation name instead of the Racket version string Runtime: ---------- Added ARM support to JIT Added #%declare Cross-phase persistent modules must be declared with (#%declare #:cross-phase-persistent) Add configure-runtime submodule support, and changed racket/base to introduce a configure-runtime submodule Removed memq, memv, and member from #%kernel Filesystem and environment variables: ---------- Changed initialization of current-directory to use PWD Added current-environment-variables, environment-variables-ref, environment-variables-set!, environment-variables-names, environment-variables-copy, bytes-environment-variables-name?, string-environment-variables-name?, environment-variables?, and make-environment-variables Added current-directory-for-user, srcloc->string Added filesystem-change-evt, filesystem-change-evt?, and filesystem-change-evt-cancel Added 'fs-change mode to system-type Move explode-path from racket/path to racket/base Changed read-on-demand-source to support #t Added current-module-path-for-load, exn:fail:syntax:missing-module, exn:fail:filesystem:missing-module, prop:exn:missing-module, exn:missing-module?, and exn:missing-module-accessor Changed string->path-element and bytes->path-element to raise an exception for an empty [byte-]string argument Changed path-replace-suffix to raise an exception when a path element would be made empty Changed syntax-local-lift-context to distinguish top-level environments Datatypes: ---------- Added hash-clear, hash-copy-clear, hash-clear!, and hash-empty? Allow hash table chaperones and impersonators to support efficient hash-clear and hash-clear! Added path results setup/dirs: added find-share-dir, find-user-share-dir, and more setup/infotab: removed string-constants require as an allowed form setup/collects: added setup/collection-name: added pkg/path: added, re-exported by pkg/lib net/url: add support for HTTP/1.1 connections net/url: add Host: and Content-Length: headers to HTTP requests (if they are not already included) xml: added a #:insert-newlines? argument to write-xexpr ffi/unsafe: added array-type and in-array ffi/unsafe/objc: add -A and +A method modes mrlib/terminal: new library Version 5.3.4, April 2013 Added extflonums Added file-truncate Added impersonate-ephemeron Added 'so-mode mode for system-type Changed syntax-case, etc. to support box patterns Change sync, wrap-evt, and handle-evt to support multiple evt results Added port-counts-lines? Added cross-phase persistent module inference and instantiation and module-compiled-cross-phase-persistent? racket/kernel: removed #%top-interaction racket/kernel/init: added racket/extflonum: added racket/unsafe/ops: added extflonum operations racket/date: changed current-date to provide nanoseconds, added date*->seconds racket/udp: added multicast support: udp-multicast-join-group!, udp-multicast-leave-group!, udp-multicast-interface, udp-multicast-set-interface!, udp-multicast-set-loopback!, udp-multicast-loopback?, udp-multicast-set-ttl!, udp-multicast-ttl, and added reuse? argument to udp-bind! ffi/unsafe: changed ffi-lib to use (system-type 'so-mode) ffi/unsafe: added _size, _ssize, _ptrdiff, _intmax, _uintmax ffi/vector: added f80vectors compiler/zo-structs: added flags field to mod slideshow: added interactive slideshow/balloon: added balloon-enable-3d slideshow/pict: added color% objects to text-style/c scribble: 'toc-hidden style on a part no longer hides ToC entries for sub-parts when rendering as HTML scribble/manual: added #:id option to defthing scribble/srcdoc: added begin-for-doc, struct-doc, and struct*-doc added #:omit-constructor argument to defstruct and defstruct* scribble/eval: extended make-base-eval to be more like make-evaluator scribble/latex-properties: added command-extras scriblib/figure: add #:continue? option syntax/datum: Changed datum-case to support box patterns racket/gui/base: moved warp-pointer from canvas<%> to window<%> and restored its functionality racket/gui/base: changed menu-bar% get-frame method to return 'root for root menu bar syntax-color: added special support for dont-stop values; this change is backwards incompatible for code that calls lexers and may call unknown lexers syntax-color/racket-lexer: added 'hash-colon-keyword (which also affects syntax-color/scheme-lexer, syntax-color/module-lexer, and syntax-color/scribble-lexer) srfi/19: made compatible with date* structs, produces lax-date struct for backwards compatibility Version 5.3.3, February 2013 No changes Version 5.3.2, January 2013 Changed case to use equal? instead of eqv? Changed log-message to support a name argument Changed the synchronization result of a log receiver to include an event name Added exn:fail:filesystem:errno and exn:fail:network:errno Added phantom byte strings Added 'word mode to system-type Added arguments to impersonate-prompt-tag and chaperone-prompt-tag to support interposition on non-composable continuation results Add #fx() and #fl() reader forms for flvectors and fxvectors racket/unsafe/ops: added unsafe-cons-list racket/gui: added get-current-mouse-state, and added display-changed to frame% racket/serialize: fxvectors and flvectors are serializable racket/net: added uri-path-segment-unreserved-encode racket/url: added current-url-encode-mode racket/date: fixed 'iso-8601 date formatting scribble/tag: added scribble/base: added make-section-tag, taglet? r5rs, r6rs: fixed case and cond to disallow internal definitions in clauses ffi/com: added com-get-property* file/untar: added file/untgz: added file/unzip: added compiler/zo-structs: generalize flonum? field to type field in localref, let-one, and fun compiler/zo-structs: added a constantness field to module-variable Version 5.3.1, October 2012 Changed make-log-receiver to accept a logger name as an event filter Addded define-logger Changed -W, -L, PLTSTDERR, and PLTSYSLOG to support log filters of the form " = ..." Changed log-error, etc., to support format mode Changed case to dispatch in logarithmic time Added racket/format, which is re-exported by racket Added #:break and #:final clauses to for forms Added exn:break:hang-up and exn:break:terminate, added extra argument to break-thread and place-break, and redirect SIGTERM and SIGHUP as breaks Add #:fill option to for/vector, for*/vector, for/flvector, for*/flvector, for/fxvector, and for*/fxvector Added PLTCOMPILEDROOTS and --compiled/-R command-line flag Added reroot-path Changed a thread's initial prompt to use the default handler (instead of accepting and ignoring abort arguments) ffi/unsafe: added cpointer-gcable? racket/class: added dynamic-get-field and dynamic-set-field! racket/set: added set-first and set-rest, sets are streams racket/require-transformer: an import's module path can be syntax scribble/base: add items/c scribble/decode: add spliceof syntax/for-body: added Version 5.3, August 2012 Added submodules, including module* Changed the format of error messages Added raise-argument-error, raise-result-error, raise-arguments-error, raise-range-error Added impersonate-continuation-mark-key, chaperone-continuation-mark-key, make-continuation-mark-key, continuation-mark-key?, impersonate-prompt-tag, and chaperone-prompt-tag Added progress-evt?, thread-cell-values?, prefab-key?, semaphore-peek-evt?, channel-put-evt? Fixed handle-evt to disallow a handle-evt Added variable-reference->module-path-index Added syntax-local-submodules, module-path-index-submodule, and module-compiled-submodules Changed module-path-index-join to support a submodule argument Changed module-path? to report #t for paths Changed resolved module paths to allow lists that represent submodule paths; see the revised contract on resolve-module-path-name Changed the module name resolver protocol so that a module declaration always triggers a notifification, and a notification supplies a source namespace (i.e., an extra argument) for attaches Changed the load/use-compiled handler protocol to subpport a submodule module Changed current-write-relative-directory to support a pair of paths: relative-to and base Changed local-expand to not add core forms if the stop list has just module* Changed modules instantiation so that requires are instantiated in the order that they are required Changed #lang for most languages so that it cannot be nested; this change is within syntax/module-reader and applies to racket, racket/base, and more Added relative-in Added box-cas! Changed contract on date second field to disallow 61, since leap seconds never appear more than once per minute Changed guarantee of portability of current-seconds and file-or-directory-modify-seconds Changed impersonate-struct so that accessor impersonation works only if the field is accessible via the current impersonator or a mutator for the same field is also impersonated Added racket/future to re-exports of racket racket/contract: added procedure-arity-includes/c, prompt-tag/c, and continuation-mark-key/c racket/control: added call/prompt, call/comp, abort/cc and allow #:tag argument for % and f-control racket/future: handle internal stack overflow without necessarily blocking on process 0; added 'overflow and 'start-overflow-work log events racket/list: added optional arguments to add-between, including #:splice?, #:before-first, #:before-last, and #:after-last racket/math: added degrees->radians, radians->degrees, nan?, infinite?, exact-round, exact-floor, exact-ceiling, exact-truncate racket/flonum: added flexpt racket/unsafe/ops: added unsafe-flexpt ffi/unsafe: changed ffi-lib to open libraries in local mode by default; integer-type bounds are now consistently checked; added prop:cpointer racket/draw: added record-dc%, make-color, make-brush, and make-pen; treat a face as a Pango font description only when it contains a comma racket/gui: changed open-output-text-editor to by default deliver content via the current eventspace's handler thread; also added an #:eventspace optional argument ffi/com: added mysterx: removed ActiveX support plus com-add-ref and com-ref-count; use ffi/com, instead compiler/zo-structs: added a context field to all-from-module, added a cancel-id field to phase-shift, added pre-submodules and post-submodules field to mod, changed name field to allow a list of symbols racket/sandbox: added sandbox-propagate-exceptions; added sandbox-gui-enabled and sandbox-make-namespace; deprecated gui?, which is no long used internally; changed the default for sandbox-namespace-specs to sandbox-make-namespsace racket/cmdline: add #:ps for command-line slideshow/start: run a `slideshow' or `main' submodule, if any scribble/eval: added eval:result and eval:results racket/system: improved error messages by replacing memv expressions with string-no-nuls? and bytes-no-nuls? Version 5.2.1, January 2012 Changed I/O scheduling to use epoll()/kqueue() when available Cross-module inline trivial functions, plus map, for-each, andmap, and ormap; 'compiler-hint:cross-module-inline hint Intern numbers, characters, strings, byte strings, and regexps in read and datum->syntax Added datum-intern-literal Regexps are `equal?' when they have the same source [byte] string and mode Added pseudo-random-generator-vector? Added port-closed-evt Generalized gcd and lcm to work on rationals Added module-predefined? Added optional #:fail argument to collection-file-path and collection-path Changed the racket -k command-line flag racket/class: added send/keyword-apply and dynamic-send racket/draw: added get-names to color-database<%> mzlib/pconvert: added add-make-prefix-to-constructor parameter, which changes the default constructor-style printing in DrRacket to avoid a make- prefix; the HtDP languages set the parameter to #t at-exp, scribble: dropped distinctness of @{}-introduced newline strings racket/draw: add text-outline to dc-path% net/mime: allow any subtype in input; made exception structs a subtype of exn:fail compiler/zo-structs: added inline-variant racket/stream: added stream constructor racket/draw: treat a face as a Pango font description Version 5.2, November 2011 Generalized begin-with-syntax to allow phase-N definitions, both variable and syntax, within a module for all N >= 0; removed define-values-for-syntax from fully expanded forms; added begin-with-syntax to fully expanded forms Changed the location-creation semantics of internal definitions and letrec-syntaxes+values (to make them more let-like) Added support for the collection links file, including (find-system-path 'links-file) and the raco link command Added exn:fail:syntax:unbound Added date*, which extends date to include nanoseconds and a time zone name Changed seconds->date to accept a real number return a date* Added set-port-next-location! and changed the default prompt read handler to use it when input and output ar terminals Changed syntax-local-module-defined-identifiers to return a table for all phases instead of just two values Add syntax-transforming-module-expression? and variable-reference->module-base-phase Added variable-reference->module-declare-inspector, which allows a macro or other syntax tool to get the enclosing module's declaration-time inspector for taint operations Added syntax-shift-phase-level Removed built-in support for Honu reading and printing racket/unsafe/ops: added unsafe-list-ref and unsafe-list-tail ffi/unsafe: added support for C arrays and unions ffi/unsafe: changed define-cstruct to use an interned symbol tag, which means that it is not generative racket/place: added place* and dynamic-place* to specify the input, output, and error ports to use for a new place racket/place: cpointers, file-stream ports, and TCP ports can be sent across place channels racket/gui: moved set-icon method from frame% to top-level-window<%> racket/gui: removed unsupported MDI styles and method errortrace: with-mark and make-st-mark now take a phase level compiler/zo-structs: removed def-for-syntax, added seq-for-syntax, changed some mod fields, added field to def-syntaxes net/url: added support for redirections to get-pure-port planet: made the planet module-name-resolver thread-safe, and fixed planet to use already-downloaded .plt files (when present) framework: the finder get-file and put-file dialogs no longer normalize their results framework: added to the testing library so that tests can be run when ignoring focus information from the underlying OS compiler/cm: added support for using more powerful security-guards when writing to the filesystem mrlib/include-bitmap: adjust include-bitmap so it does not write to the filesystem Removed the Racket-to-C compiler: raco ctool -e/-c, mzc -e/-c, compile-extensions, compile-extensions-to-c, compile-c-extensions, compiler/cffi, compiler/comp-unit, compiler:inner^, and most options in compiler/option The The `lazy' language is now based on `racket' instead of `mzscheme'. Specifically, it now uses modern `require's and `provide's. Version 5.1.3, August 2011 No changes Version 5.1.2, August 2011 Replaced syntax certificates with syntax taints: Added syntax-tainted?, syntax-arm, syntax-disarm, syntax-rearm, syntax-taint, and syntax-protect Changed syntax-recertify and syntax-local-certifier to have no effect on the target syntax object Changed syntax-rules and syntax-id-rules to use syntax-protect implicitly Changed the way inspectors are associated to syntax objects and variable references in compiled code Changed "sequence" to include exact nonnegative integers Added #:unless clause to for Changed procedure-arity-includes? to report #f for keyword-requiring procedures by default mzlib/contract: removed (undocumented) exports: chaperone-contract-struct? contract-struct-first-order contract-struct-name contract-struct-projection contract-struct-stronger? contract-struct? flat-contract-struct? make-opt-contract/info opt-contract/info-contract opt-contract/info-enforcer opt-contract/info-id synthesized-value unknown? Changed assoc to accept an optional equality predicate racket/function: added identity, thunk, thunk*, compose1 racket/require: added multi-in slideshow/pict: added rotate function, and added sxy anf syx fields to a child structure compiler/zo-struct: removed certificate structures; changed wrapper to have a tamper-status field instead of certs; added toplevel-map field to lam Version 5.1.1, May 2011 Enabled single-precision floats by default Added single-flonum? Changed eqv? so that inexacts are equivalent only when they have the same precision Changed file-or-directory-permission to add 'bits mode and permission-setting mode Added special treatment of void as an 'inferred-name property Removed the "MrEd" compatibility executable under Windows and Mac OS X, but the "mred" compatibility script remains racket/gui: added multi-column support to list-box% racket/gui: added scrollbar support to panel%, vertical-panel%, and horizontal-panel% racket/gui: added 'wheel-left and 'wheel-right events racket/file: add user-read-bit, etc. racket/contract: removed the following (undocumented) exports: build-flat-contract chaperone-contract-struct? contract-struct-first-order contract-struct-name contract-struct-projection contract-struct-stronger? contract-struct? contracted-function contracted-function-ctc contracted-function-proc contracted-function? first-order-get first-order-pred? first-order-prop flat-contract-struct? flat-get flat-pred? flat-prop make-opt-contract/info name-get name-pred? name-prop opt-contract/info-contract opt-contract/info-enforcer opt-contract/info-id proj-get proj-pred? proj-prop stronger-get stronger-pred? stronger-prop struct:contracted-function synthesized-value unknown? Version 5.1, February 2011 Renamed "proxy" to "impersonator" Added current-get-interaction-input-port, which enables racket/gui events to be dispatched while a REPL is blocked Changed equal? to equate C pointers when they refer to the same address Internal: weak boxes are cleared before non-will-like finalizers; use late-weak boxes to get the old behavior Version 5.0.2, October 2010 Changed body of `when', `unless', `cond' clauses, `case' clauses, and `match' clauses to be internal-definition contexts Swapped unsafe-vector*-ref with unsafe-vector-ref, etc. Added ->i to the contract library, improved ->*, adding #:pre and #:post, as well as making the optional arguments clause optional. Added #true and #false, and changed #t/#T and #f/#F to require a delimiter afterward Added print-boolean-long-form Added read-accept-lang, which is set to #t when reading a module Added flonum? Changed continuation-marks to accept a #f argument to produce an empty set of marks Added fxvectors Added unsafe-{s,u}16-{ref,set!} Added prop:proxy-of Added proxies to go with chaperones, and renamed chaperone property as proxy property; beware that the word "proxy" will change in a future version, perhaps to "impersonator" Added collection-file-path and collection splicing at the file level Version 5.0.1, July 2010 Continuation barriers now block only downward continuation jumps and allow escapes through full continuations Changed internal-definition handling to allow expressions mixed with definitions Added support for subprocesses as new process groups Added support for best-effort termination of subprocess by a custodian Added flreal-part, flimag-part, make-flrectangular, and unsafe variants Added fl->eact-integer, fl->fx, and unsafe-fl->fx Added #:async-apply option to _fun Added chaperone-evt Added identifier-prune-to-source-module Changed apply binding to enable lower-level optimizations Upgraded to libffi 3.0.9+ Version 5.0, May 2010 Changed the core executable from mzscheme to racket Changed paths like the preferences file to use "racket" instead of "mzscheme" or "plt-scheme" Changed default value printer to use quasiquote style The language of a program's main module can specify run-time configuration actions, such as setting the default printer's style Changed regexp-match* et al. to make ^ matching relative to the original string (not substrings for matches after the for) and to allow empty matches in all positions except immediately after an empty match Changed regexp-match and other functions to allow a path as an input Added chaperones Version 4.2.5, March 2010 Added scheme/future, enabled by default on main platforms Changed module to wrap each body expression in a prompt Changed define-cstruct to bind type name for struct-out, etc. Version 4.2.4, January 2010 Added scheme/flonum and scheme/fixnum Extended scheme/unsafe/ops Changed JIT to support unboxed local binding of known-flonum arguments to unsafe-fl functions Changed JIT to inline numeric ops with more than 2 arguments Added #:save-errno option for foreign-function types Added module->imports and module->exports Version 4.2.3, November 2009 Changed _pointer (in scheme/foreign) to mean a pointer that does not refer to GCable memory; added _gcpointer Added scheme/vector Version 4.2.2, September 2009 Added scheme/unsafe/ops Added print-syntax-width Added file-or-directory-identity Inside: embedding applications should call scheme_seal_parameters after initializing parameter values (currently used by Planet) Version 4.2.1, July 2009 Added string->unreadable-symbol and symbol-interned? Added syntax-local-lift-provide Added syntax-local-lift-values-expression Added identifier-prune-lexical-context and quote-syntax/prune Version 4.2, May 2009 Changed visiting of modules at phase N to happen only when compilation at phase N starts Changed expander to detect a reaname transformer and install a free-identifier=? syntax-object equivalence Changed provide to convert an exported rename transformer to its free-identifier=? target Added 'not-free-identifier=? syntax property to disable free-identifier=? propagation through a rename transformer Added prop:rename-transformer and prop:set!-transformer Fixed scheme/local so that local syntax bindings are visible to later local definitions Changed current-process-milliseconds to accept a thread argument Added hash-hash-key?, hash-ref! Added in-sequences, in-cycle Version 4.1.5, March 2009 Allow infix notation for prefab structure literals Change quasiquote so that unquote works in value positions of #hash Change read-syntax to represent #hash value forms as syntax Added bitwise-bit-field Version 4.1.4, January 2009 Changed memory accounting to bias charges to parent instead of children Changed function contracts to preserve tail recursion in many cases Added scheme/package, scheme/splicing, ffi/objc Added exception-backtrace support for x86_84+JIT Added equal?/recur Added equal<%> and interface* to scheme/class Added procedure-rename Added extra arguments to call-with-continuation-prompt Added extra argument to raise-syntax-error Added compile-context-preservation-enabled Added syntax-local-lift-require Added internal-definition-context-seal, which must be used on an internal-definition context before it's part of a fully expanded form Added syntax-local-make-delta-introducer Changed make-rename-transformer to accept an introducer argument that cooperates with syntax-local-make-delta-introducer Added internal-defininition-context? Added identifier-remove-from-defininition-context Version 4.1.3, November 2008 Changed scheme to re-export scheme/port In scheme/port: added Added call-with-immediate-continuation-mark In scheme/port: added port->string, port->bytes, port->lines port->bytes-lines, display-lines, [call-]with-input-from-{string,bytes}, and [call-]with-output-to-{string,bytes} In scheme/file: added file->string, file->bytes, file->lines, file->value, file->bytes-lines, write-to-file, display-to-file, and display-lines-to-file Added variable-reference? and empty #%variable-reference form Extended continuation-marks to work on a thread argument Version 4.1.2, October 2008 Changed binding of identifiers introduced by unit signatures to take into account the signature use's context Added make-syntax-delta-introducer Changed continuation-marks to accept a thread argument Added eqv-based hash tables Added hash-update and hash-update! Changed -X and -S to complete directory relative to pwd, and changed -S to add after main collects Version 4.1.1, October 2008 Added read-language Added module-compiled-language-info, module->language-info, and 'module-language property support Version 4.1, August 2008 Changed namespaces to have a base phase; for example, calling eval at compile-time uses a phase-1 namespace Added logging facilities: make-logger, etc. Added "inheritance" to structure type properties, and change prop:procedure from scheme/base to better support keywords Added bitwise-bit-set? Added in-value Version 4.0, June 2008 >> See MzScheme_4.txt Version 372, December 2007 Added syntax-local-lift-context Added #lang Added require-for-label, provide-for-syntax, provide-for-label, identifier-label-binding, module-label-identifier=? Version 371, August 2007 Added hash-table-iterate-{first,next,key,value} Added keyword and #!/ to general comment forms Added continuation? Added continuation-prompt-tag? Inside MzScheme: GC_{malloc,free}_immobile_box foreign.ss: added {malloc,free}-immobile-box Version 370, May 2007 Memory management: Default build uses 3m instead of CGC Added custodian boxes and custodian-memory-accounting-available? Added initial custodian argument to custodian-require-memory Exceptions: Removed current-exception-handler and initial-exception-handler Added uncaught-exception-handler Default error escape handler aborts to default continuation tag with the void procedure Added call-with-exception-handler Changed read-eval-print-loop and the default load handler to wrap each evaluation with a prompt and with #%top-interaction Changed top-level begin to insert a prompt around each sub-expression except the last Added #%top-interaction and #%expression Changed make-exn to automatically convert a mutable message string to an immutable string Units: New unit system provided by MzLib's "unit.ss" Ports and pathnames: Added prop:input-port and prop:output-port Added support for manipulating filesystem paths that work on other platforms Added string->path-element and path-element->string Changed path->directory-path, simplify-path, and split-path to include a trailing path separator even when the result would be a directory path without it Changed simplify-path for Windows paths to replace / with \ Changed current-directory to apply path->directory-path to given paths Added reset?, start-, and end-index arguments to get-output-bytes Added port-closed? Added optional argument to tcp-addresses to get port numbers Syntax and loading: Default load handler enables #reader (even when not reading a module) Added module-path-index-resolve Added syntax-local-expand-expression Changed dyanmic-require to expand requests for exported syntax bindings Added an argument to syntax-local-certifier indicating whether the generated procedure attaches active or inactive certificates Changed macro expansion of bound identifiers so that `local-expand' works with an empty stop list Module top-level enforces initial categorization of expressions versus other forms Changed H-expression parsing to represent angle brackets specially Misc: Changed print-struct default to #t instead of #f Added parameterize* Added 'gc and 'so-suffix flags for system-type Added vector->values Changed char-whitespace? to produce #t for #\u0085 Added -p, -P, and -Q command-line options Added procedure-struct-type? Added system-idle-evt Fixed mzc --exe to work with C-implemented extension modules MzLib: serialize.ss: Path includes the path's convention foreign.ss: Added ptr-add, memmove, memcpy, and memset runtime-paths.ss: Cooperates with mzc --exe Inside MzScheme: Use SCHEME_INPUT_PORTP() instead of SCHEME_INPORTP() SCHEME_OUTPUT_PORTP() instead of SCHEME_OUTPORTP() scheme_input_port_record() instead of cast to Scheme_Input_Port* scheme_output_port_record() instead of cast to Scheme_Output_Port* Added scheme_set_type_equality() with help from Dimitris Vyzovitis Added XFORM_START_SKIP, etc. Version 360, November 2006 Continuations: Added delimited continuations: call-with-continuation-prompt, call-with-composable-continuation, etc. Changed call-with-escape-continuation so that its argument is no longer applied in tail position (reverses a change in v350) Regexps: Added case-insensitive mode, multi-line mode, lookahead, lookbehind, non-backtracking, and conditionals to regexp language Added pregexp, byte-pregexp, and #px..., which includes numeric quantifiers, backreferences char classes, and Unicode predicates Added regexp-match?, pregexp?, and byte-pregexp? Improved [p]regexp performance Filesystem: Unix and Mac OS X: Changed path operations to use "./~..." as an encoding for a relative path "~..." Changed simplify-path to always normalize path separators, preserve syntactic directoryness, and remove \\?\ from Windows paths when possible Added path-element->bytes and bytes->path-element Changed make-file-or-directory-link to not expand the link content, and changed make-security-guard to have a separate link guard procedure Misc: Removed write-image-to-file and read-image-from-file ormap and andmap now tail-apply a given function for the last list element(s) eval evaluates its argument in tail position Improved compilation of call-with-values and an immediate lambda argument to avoid closure creation Added raise-arity-error Changed bytecode compiler to perform more closure conversion and lifting Changed local-expand; #f stop list means expand only immediate MzLib: class.ss: added inherit/inner and inherit/super, to eventually replace rename-super and rename-inner; added member-name-key=? Version 352, July 2006 Minor bug fixes Version 351, July 2006 Changed hash-table-get to accept a non-prcedure third argument as a default value (instead of requiring a thunk) Changed the module name resolver protocol so that the resolver is required to accept 1, 3, and 4 arguments; the new 4-argument mode supports resolving a module path without loading the module Changed syntax/loc to not adjust location information for a template that contains only a pattern variable MzLib: Added define-member-name, member-name-key, and generate-member-key to class.ss Added syntax-local-lift-moule-end-declaration Changed namespace-attach-module and namespace-unprotect-module to accept quoted module paths, instead of only symbolic names Fixed avoidable overflow and underflow in magnitude and / for inexact complex numbers Fixed bug in continuation sharing Improved 3m performance Upgraded to gc 6.7 Version 350, June 2006 JIT compiler: Added just-in-time native-code compiler with a new eval-jit-enabled parameter Added compile-enforce-module-constants parameter; the default is #t, which effectively prohibits redeclaraing modules or changing variable bindings through module->namespace Added function inlining, and fixed constant propagation and folding in bytecode compiler Stack trace: Added a "stack trace" to the default error display Added exn:fail:user and raise-user-error Installation and executables: Changed installation process to support more configurable directory structure Dropped PLTHOME, and instead added support to embed a path to the main "collects" directory within the executable Changed style of executables generated by mzc --[gui-]exe under Unix; for old-style executables, use --orig-exe, or use --exe-dir to package the executable Added 'run-file, 'collects-dir, and 'orig-dir modes to find-system-path Changed initial program binding to the result of find-system path with 'run-file instead of 'exec-file Added use-user-specific-search-paths parameter, -U flag Continuations: For nested captured continuations, the shared continuation tail is represented by shared data The body of let/cc and the procedure passed to call/ec are evaluated/called as a tail expression/call Made parameter/mark lookup amortized constant time, instead of potentially O(stack depth) Misc: Added char-general-category Added string-normalize-nf[k]{d,c} Changed bitwise-{and,ior,xor} to accept 0 arguments Changed file-position: eof moves to the end of a file/string Changed readtable to support "default" parser used for symbols/numbers Changed system-type's optional argument to 'os, 'link, or 'machine Added current-thread-initial-stack-size Added procedure-closure-contents-eq? Added struct-type-make-constructor and struct-type-make-predicate Inside MzScheme: added scheme_make_prim_closure_w_arity(), etc. Version 301, December 2005 Fixed a custom-input-port bug in the case that a read or peek procedure returns an event created by handle-evt Version 300, December 2005 Generalized network-address handling, includes IPv6 Added ephemerons 0.0 and -0.0 are different by eqv? Added keyword values (#: prefix) and keyword? predicate Added system-language+country Added current-preserved-thread-cell-values Added #%variable-reference MzLib: added object-method-arity-includes? to class.ss Added --xform mode to mzc Version 299.400, Setember 2005 Improved Windows path support (e.g., \\?\ paths) Added optional argument to simplify-path Added 'pair-shape property to reader Inside MzScheme: added scheme_get_port_file_descriptor() and scheme_get_port_socket() Version 299.200, August 2005 Ports: TCP output ports are now block-buffered by default Changed file-stream-buffer-mode to work on more port types, including TCP ports and custom ports Added extra argument to make-input-port and make-output-port to get/set buffer mode Changed port-count-lines! and port-next-location to work on output-ports Changed make-output-port to take three new arguments: get-location procedure, count-lines! procedure, and initial position Changed make-input-port to take two new arguments: count-lines! procedure (defaults to void) and initial position Added relocate-input-port, relocate-output-port, transplant-input-port, and transplant-output-port to MzLib's "port.ss" Strings and Unicode: \U allows up to 8 digits instead of 6 Changed char-lower-case? and char-upper-case? Added string-upcase, string-downcase, string-titlecase, string-foldcase, and char-foldcase In case-insensitive mode, symbols are case-folded instead of downcased (which is usually the same thing) Reader: Added #reader and readtables When { or [ is disabled, it is treated as an illegal character instead of a symbol character by the reader Changed read-syntax[/recursive] to remove the delta-list argument Changed read handler to remove the delta-list argument Changed read[-syntax]/recursive to produce a special-comment value when a comment is parsed (instead of reading the next datum) Printer: Added custom struct writers through prop:custom-write, custom-write?, custom-write-accessor Syntax and Macros: Changed expansion of internal definitions so that local macros that expand to definition forms can be used within the local definition set Added syntax-local-make-definition-context Added syntax-local-bind-syntaxes Added optional definition-context argument to local-expand and syntax-local-value Changed certification so that a reference cannot have more certificates than its binding, and lexical context gives syntax-quoted values inactive instead of active certificates Added sub-form for require: only Added module-provide-protected? Fixed all-from provides to include redundant imports from the indicated require Added prefix-all-defined and prefix-all-defined-except provide forms Structure Types: Struct custodian can be #f to make it fully transparent Libraries: Added define-serializable-class[*], externalizble<%>, class/derived, and inspect clause form to MzLib's "class.ss" Changed run-server in thread.ss to use the same parameterization for all connection threads Added define-struct/properties to MzLib's "struct.ss" Removed pretty-print-display-string-handler from MzLib's "pretty.ss", and adapted protocol for hook procedures slightly (i.e., they usually must write to a given port) Changed collects/web-server request-bindings/raw to return an alist of bytes, not strings Misc: Cygwin build produces a Unix-style installation instead of a Windows-style installation (e.g., system-type is 'unix) Version 299.100, March 2005 Unicode and Strings: Removed char-locale... operations Removed char->latin-1-integer and latin-1-integer->char Added string-copy!, read-string!, peek-string!, and write-string Added convert-stream, reencode-input-port, etc. to port.ss Added \u and \U syntax in strings and chars Fixed log for large exact integers Added path-string?, path-replace-suffix Renamed all of the number "byte-string" functions to "bytes" Added \' escape for strings (for compatibility with C & Java) Added locale-string-encoding Changed regexp-replace* to raise an exception if it matches an empty string Added binding of greek-lambda character (code point #x03BB) to expand to lambda Paths: Changed pref dir (all platforms) and pref file name (except Windows); changed home dir under Windows to use the registry-specified profile directory Added 'doc-dir and 'desk-dir to find-system-path Unix and Mac OS X: path expansion removes redundant slashes Removed exists check for current-directory Ports: Change default buffering of file-stream output ports Changed file-stream-buffer-mode to work on input ports Changed make-custom-input-port to make-input-port Changed make-custom-output-port to make-output-port Added terminal-port? Added pipe-content-length Changed {read,peek}-bytes-avail!{,*,/enable-break} to produce a special-reading procedure when a stream contains specials Added make-pipe-with-specials to MzLib's "port.ss"; procedures like copy-port now also handle specials Moved most of (lib "thread.ss") to (lib "port.ss"), and many remaining useless procedures (such as dynamic-enable-break) were removed Added port-progress-evt, port-commit-peeked, and port-provides-progress-evts? Added an optional progress-event argument to peek-bytes-avail!, etc., before the port argument Added an optional progress-event argument to regexp-match-peek and regexp-match-peek-positions Peeking from a limited pipe effectively increases its capacity, temporarily Added optional port name arguments to make-pipe and open-{input,output}-{string,bytes} Changed object-name for input ports and output ports Added write-special and write-special-avail* A location-offset lists for a port read handler can contain #f Changed read-syntax to make the source name optional (defaults to the port's name) Syntax and Macros: Eliminated "identifier for a definition has a module context" errors In a syntax template, when an identifier has more ellipses then in the pattern, inner ellipses bind more tightly than the outer ellipses New forms: require-for-template (core), define-values-for-syntax (core), define-for-syntax, begin-for-syntax New procedures: local-transformer-expand, syntax-transforming?, syntax-local-lift-expression, local-expand/capture-lifts, local-transformer-expand/capture-lift, syntax-recertify, module-template-identifier=?, identifier-template-binding, rename-transformer-target Removed fluid-let-syntax, syntax-local-certifier Added (lib "stxparam.ss"), partly as a replacement for fluid-let-syntax Removed use of #%top from references to a module's own bindings Added protect sub-form of provide module-compiled-imports now returns 3 values indentifier-[transformer-]binding returns a list of five items instead of four for a module-bound identifier Added 'module-begin to the set of possible results from syntax-local-context Added begin-with-definitions to (lib "etc.ss") Added syntax-property-symbol-keys Added namespace-unprotect-module Changed eval, expand, etc. so that only the leading identifier in a module form is given context Changed module expansion/compilation so that it's deterministic, as long as macros do not use gensym or external side-effects; using generate-temporaries preserves determinism Changed module->namespace and module re-definition so that they're controlled by the code inspector, not the modules attach state Added current-compile parameter, which is used by compile and by the default evaluation handler Changed expansion-time structure type info to allow #f in place of a mutator id Added construct-time field guards to structure types Changed raise-syntax-error so that it no longer accepts a list as its first argument Reader Syntax: Added #<< here strings Added H-expression mode to reader, triggered by #hx or #honu, and escaped by #sx Added read-honu, read-honu-syntax, and print-honu Changed #; for top-level read; graph assignments are forgotten before reading the next expression Control Flow and Paramaters: While an exception handler is called, the current exception handler is reset to the default handler; similarly, the error display and escape handlers are called by the default exception handler in a context that resets the corresponding parameters to the default handlers An exception handler can handle exceptions that are raised during the handler (by using with-handlers or setting the current-exception-handler parameter) During the evaluation of dynamic-wind pre and post thunks, the current continuation marks and parameterization are reset to those active at the time of the dynamic-wind call (except that the parameterization is extended to disable breaks) Added current-parameterization and call-with-parameterization Added continuation-mark-set-first Removed optional argument of continuation-mark-set->list Added continuation-mark-set->list* Added call-with-continuation-barrier Renamed "continuation boundary" to "continuation barrier" Added call-with-semaphore and call-with-semaphore/enable-break Events: Renamed udp-send-evt and udp-receive-evt to udp-send-ready-evt and udp-receive-ready-evt Added udp-send-evt, udp-send-to-evt, and udp-receive!-evt Added tcp-accept-evt Added make-alarm Misc: Regexp grammar changed to match docs with respect to "-" Struct property types are now overridable in subtypes Added module-compiled-exports Added hash-table-copy and hash-table-count Changed the random-number generator to use L'Ecuyer's MRG32k3a algorithm, as encouraged by SRFI-37 Changed random to accept 0 arguments to generate a random real number, and added pseudo-random-generator->vector and vector->pseudo-random-generator; these are compatible with the SRFI-27 reference implementation Added print-unreadable parameter Changed use-compiled-file-kinds to use-compiled-file-paths Mac OS X: extension suffix changed from ".so" to ".dylib" Libraries: "class.ss" MzLib module: changed the interface to make-primitive-class; see plt/collects/mzscheme/examples/tree.cxx for details "serialize.ss" MzLib module: new "contract.ss" MzLib module: names are more uniform; if the name of a contract a suffix, the suffix is now "/c" (instead of one of "/p", "/c", or "/f") "url.ss" in the "net" collection: new url data definition; url/user is gone, and no extra encoding/decoding required once a url has been parsed anymore Inside MzScheme: Added scheme_set_type_printer, scheme_print_bytes, and scheme_print_string Version 209, December 2004 Fixed (abs -1073741824) Avoided gcc 3.4 bug(?) related to inline checking for -0.0 Version 208, August 2004 Added string-copy! and hash-table-count Upgraded to gc 6.3 Version 207, May 2004 Fixed comparison of infinities and 0.0 in eqv? Fixed incorrect handling of -0.0 versus 0.0 for various platforms, including x86 with gcc 3.2 Fixed inefficient (/ x 1) for an exact rational x Version 206, January 2004 A shut-down custodian is no longer allowed to manage new objects Changed thread-resume so that it adds custodians to a thread, instead of changing the thread's custodian Added make-thread-group, etc. Changed define to support MIT-style curried-procedure forms Added an optional argument to peek-char and peek-char-or-special to indicate the number of characters to skip in the input stream Added optional argument to file-or-directory-modify-seconds for setting the modification date of a file or directory Added integer-sqrt, quotient/remainder, integer-sqrt/remainder Fixed transitivity of numerical comparison for mixed inexact--exact comparisons when the inexact versions of the numbers are = but the exact versions are not Macro templates can include consecutive ... for splicing sequences Macro patterns can include sub-patterns after ... Improved error reporting for with-syntax Non-constant syntax pairs generated from templates (in syntax-case, with-syntax, quasisyntax, etc.) keep source-location and context information, instead of acquiring the context and location of the generator expression as a whole generate-temporaries produces identifiers that are suitable for use as defined names in the module being expanded (if any) Added syntax-local-module-introduce, which is used by generate-temporaries Added syntax-track-origin Changed syntax-local-get-shadower to add the current module expansion context, if any Added 'disappeared-binding and 'disappeared-use properties and refined 'origin tracking for internal definitions and spliced sequences Added optional namespace argument to most of the namespace- primitives Added vector-immutable Fixed a bug in the bytecode verifier that caused it to skip significant parts of typical bytecode Added a hook for (planet ...) module paths to the standard module name resolver MzLib's contract.ss: changed and/f to and/c, or/f is deprecated (use union), added object contracts, flat-contracts (without names) are a separate type; use flat-contract-predicate rather than flat-named-contract, added flat-rec-contract, improved performance MzLib's class.ss: added get-field and field-bound? Version 205, August 2003 Extended regexp language with "(?:...)" Added 'addon-dir for find-system-path Changed default library collections path list to include (build-path (find-system-path 'addon-dir) (version) "collects") Added #; reader comment syntax Added namespace-module-registry Added module->namespace Changed eval handler so that when it is given a syntax object, it does not extend the object's lexical context with top-level bindings from the current namespace Added namespace-syntax-introduce Added eval-syntax, compile-syntax, expand-syntax, expand-syntax-once, and expand-syntax-to-top-form Added set!-transformer-procedure Added namespace-undefine-variable! syntax-local-context can return a list for internal-define expansion, and local-expand accepts a list to mean internal-define expansion; for built-in expansion, each list item uniquely indicates a distinct, active internal-define expansion context Added syntax-local-get-shadower Changed top-level `define-syntaxes' to treat zero results from the right-hand side as an abort, so that (define-syntax (id ...) (values)) declares the ids. This is useful for macros that expand to mutuaully recursive definitions of private variables Changed the expansion-time information associated with a struct type to include an identifier for the super-type Handling of --main/-C command-line flag changed Changed "scheme-" script handling to add the script path as an argument, which matches SRFI-22 Changed Windows extension-linking convention; extensions link directly to the MzScheme/GC DLLs Added an optional argument to system-library-subath Added custodian-managed-list Changed vector-set-performance-stats! to accept an optional thread argument for thread-specific stats Mac OS Classic: file-size result no longer includes the resource-fork size Added a `super-new' local form to (lib "class.ss") Added a `new' form to (lib "class.ss") 3m: changed to the calling convention for managing GC_variable_stack Version 204, May 2003 Added UDP operations Added synchronous channels Added thread-suspend and thread-resume Added thread/suspend-to-kill Added thread-dead? Added thread-suspend-waitable, thread-resume-waitable, and thread-dead-waitable Added make-wrapped-waitable, make-guard-waitable, and make-nack-guard-waitable a la CML Added waitables->waitable-set, which is like CML's choose Renamed make-nack-waitable to make-nack-guard-waitable to claify its relation to make-guard-waitable Added make-poll-guard-waitable Added make-semaphore-peek Added current-wait-pseudo-random-generator Changed unreachable threads to be garbage-collected when blocked on any combination of otherwise unreachable waitables by object-wait-multiple, semaphore-wait, channel-put, channge-get, or thread-wait; in addition, unreachable suspended threads are garbage-collected Added "async-channel.ss" to MzLib Changed make-custom-input-port to drop the initial waitable argument; instead, the read and peek functions should return a waitable instead of 0 Changed make-custom-output-port so that the first argument is #f or a procedure to return a waitable (instead of #f or a waitable) Added tcp-port? Added port-file-identity Deprecated normal-case-path Changed the symbolic name for a file-based module to be determined without using normal-case-path Fixed MzLib's regexp-split, etc., to work on input ports Changed make-struct-type-property to accept a guard procedure for the property Changed make-struct-type to accept a list of immutable field positions Changed struct-type-info to return 8 values instead of 6 to include information on immutable fields Changed proc-spec handling in make-struct-type; an integer value must be < init-field-k, and overriding is disallowed (for consistency with user-defined properties) Added prop:waitable Changed handling of top-level and module top-level definitions of identifiers that originate from a macro expansion; such definitions now bind only the uses of the identifier with the same expansion origin Added make-syntax-introducer, for creating new macro origins Changed generate-temporaries so that it does not use gensym, but instead uses make-syntax-introducer to distinguish names Added make-rename-transformer and rename-transformer? Changed syntax-local-value to cooperate specially with rename transformers Fixed parse problems with # in numbers, as in `1#/2' and `#e#x+e#s+e@-e#l-e' Added literal hashtable syntax #hash..., added support for immutable hash tables, and added print-hash-table parameter Added literal regexp syntax #rx... and changed the printer to use this notation for printing regexps Changed hash-table? to accept 'weak and/or 'equal and return #t only if the first argument is a hash table created with the corresponding flag(s) Changed equal? to compare hash tables by determining whether they map the same keys to equal? values Added vector->immutable-vector Added immutable-box Added vector-set-performance-stats! Changed columns to count from 0 instead of 1 Version 203, December 2002 Added support for structure types whose instances act as procedures Added open-input-output-file Added port-count-lines-enabled parameter Version 202, August 2002 Changed expansion of () to '() Unix: Fixed open on fifos to not block Windows 9x: Added workaround for resolution of "127.0.0.1" Version 201, July 2002 Fixed bug in port reading (especially variants of read-string) and file-position that follow peeks on the port Added exn:special-comment, expected to be used by custom input ports that contain non-character-based comments (e.g., the comment boxes soon to appear in DrScheme) Windows: added special handling of "special files" (COM1, etc.); internally MzScheme opens the file only once to satisfy multiple open-input-file and open-output-file calls that have the port open at the same time Version 200, June 2002 >> See MzScheme_200.txt for information on major changes in MzScheme 200. Minor changes are listed below. (cond) alays returns void; the cond-allow-fallthough parameter and exn:cond exception have been removed Changed all comparison precedures to require at least two operands, including =, <, ..., char=?, charinteger, floating-point-byte-string->real, integer->integer-byte-string, real->floating-point-byte-string, Renamed exn:misc:user-break to exn:break Removed the port field of exn:read Renamed arity to procedure-arity Replaced primitive-name and inferred-name with object-name Added security guards for controlling file and network access Added an "infix" conversion in the reader, triggered by a pair of dots between a pair of parens Added #cs and #ci prefixes for controlling case sentivity during read Added current-command-line-arguments parameter Added error-print-source-location parameter Added current-load/use-compiled parameter Changed string constants to support ANSI C escapes (e.g., \n) Fixed leaks (file descriptors, etc.) that could happen with thread kills Fixed memory bug in the run-time support for mzc-compiled code Fixed an old and serious set of tail-call+thread-or-exception+GC bugs in the core interpreter Changed the error display handler to take a raised value (usually an exception record) as a second argument Removed make-hash-table-weak and changed make-hash-table to accept up to two flag arguments: 'weak and/or 'equal Added eq-hash-code and equal-hash-code Extended regexp-match, etc. to work on port inputs Added read-strng-avail!* and write-string-avail*, which never block Added peek-string, peek-string-avail!, peek-string-avail!*, and peek-string-avail!/enable-break Added port-count-lines!, which enables line-couting for a port, and port-next-location Extended custom ports to support non-char input, added read-char-or-special and peek-char-or-special Added immutable? Quoted portions of a symbol (using | or \) preserve their case, Added read-dot-as-symbol and read-accept-quasiquote parameters Added an optional third argument to tcp-listen to reuse addresses Added tcp-connect/enable-break and tcp-accept/enable-break Added object-wait-multiple and object-wait-multiple/enable-break Added cons-immutable, list-immutable, and list*-immutable, and removed pair->immutable-pair Replaced read-dot-as-symbol with read-accept-dot Fixed quotient, remainder, and modulo when the first argument is exact 0 and the second argument is inexact Default for pconvert.ss's whole/fractional-exact-numbers parameter changed to #f Load handler or load extension handler now takes two arguments instead of one: the filename and the expected module name Added shell-execute for Windows Moved send-event to MrEd; added a "sendevent.ss" MzLib library Changed assf in MzLib Added special handling when MzScheme is invoked with the name "scheme-", useful to support SRFI-22 New implementation of Windows I/O Renamed "2k" to "3m" (for "moving memory manager") Upgraded to gc 6.1alpha2 Inside MzScheme: changed type of third argument for scheme_block_until() from void* to Scheme_Object* Inside MzScheme: added scheme_add_waitable() and scheme_add_waitable_through_sema() for extending the set of objects supported by object-wait-multiple Version 103, August 28, 2000 Changed define-values and set!-values to require distinct variables for binding Windows: Fixed bug in close-output-port for TCP ports Closing a TCP output port always sends an EOF to the other end of the connection, even if the associated input port remains open Changed order of first two arguments to process[*]/ports and fixed bugs Added an optional limit argument to make-pipe Added deflate.ss library to MzLib, providing gzip, etc. Added not-break-exn?, useful mainly as a predicate in a with-handlers expressions Fixed load/use-compiled, require-library, and many MzLib functions to propagate break exceptions correctly Added check-parameter-procedure and changed parameterize Changed order of first two arguments to process[*]/ports, and fixed bugs Fixed bugs in (eval (compile e)) Changed handling of pre- and post-queued breaks by call-in-nested-thread Unix: fixed interaction among signals, I/O, and process sleeping Unix: fixed bug in writing/closing file-stream output ports when a write error occurs MacOS: changed `split-path' to preserve the colon suffix on a root name Version 102, June 26, 2000 Switched to configure-based makefiles (autoconf) with-input-from-file and with-output-to-file close the port when control leaves the dynamic extent of the call (normally, through an exception, or through a general continuation jump). Added detail field to exn:i/o:filesystem Added immutable strings and pairs, string->immutable-string, cons-immutable, list-immutable, and list*-immutable Added read-decimal-as-inexact parameter Fixed number reader to allow +inf.0, -inf.0, and +nan.0 in complex constants Fixed bugs in number reader for hexadecimal numbers containing `.' and/or `s'/`l'-based exponents; note that `#e#x+e.s+e@-e.l-e' is a legal number(!) Fixed reading from special devices, such as /dev/null and /dev/zero, in Solaris and HP/UX Fixed blocking output (to stdout, stderr, or a process port) so that only the writing thread is blocked Changed read-string! to read-string-avail!, added read-string-avail!/enable-break Added write-string-avail and write-string-avail/enable-break Added process/ports and process*/ports Added file-stream-port? Added 'update to the set of flags for open-output-file et al. Changed default exit handler to return only results in 0 to 255 as results to the OS, and everything else means 1 Changed time-apply to return four values, and to take an argument list to provide to the timed procedure Change find-executable-path to accept #f as its second argument Change normal-case-path to remove spaces at the end of a path Changed angle on inexact zero (0 for 0.0, pi for -0.0) Fixed arithmetic-shift for a -32 shift Fixed angle on +nan.0 Fixed expt on 0 and a negative number Added 'exec-file flag to find-system-path Added provide-library Added square and mergesort to MzLib's function.ss Added tcp-addresses Added -k command-line flag Inside MzScheme: provided a way to fix the GC--thread problems under Windows, via GC_use_registered_statics Inside MzScheme: scheme_basic_env() initializes break-enabled to #f instead of #t Inside MzScheme: changed scheme_get_chars to consume an offset into the string Inside MzScheme: added embedding-settable function scheme_console_output, used to report low-level errors Inside MzScheme: restricted the format strings accepted by scheme_signal_error, scheme_raise_exn, and scheme_warning Inside MzScheme: added scheme_count_lines; scheme_tell_line can return -1 if lines are not counted for a port Inside MzScheme: added offset argument to scheme_write_string and scheme_read_bignum Version 101, October 25, 1999 Added 'sys-dir to find-system-path Added latin-1-integer->char and char->latin-1-integer Added time-zone-offset field to the date structure Added continuation field to exn:misc:user-break Windows: all network sockets are closed on exit Fixed (acos 0) Fixed (expt x y) where x is negative and y is non-integral Inside MzScheme: scheme_param_config's 2nd argument is now a Scheme_Object* Version 100, August 9, 1999 + indicates a change since 100alpha4 * indicates a change since 100alpha3 Changed class syntax, splitting public clause use into: public : defines ivars not in superclass override : defines ivars already in superclass Changed empty superclass from the empty list to object%; every class initialization must call super-init Added ivar-in-interface? + Added class-initialization-arity * Added class->interface * Added object-interface + Removed object-class + Removed ivar-in-class?; replace (ivar-in-class? x c) with (ivar-in-interface? (class->interface x c)) Changed interface: raises an exception if a superinterface declares a variable that is also declared in the interface expression Removed letrec*; letrec has the same semantics * Fixed scope of function name in a named let Internal definitions are allowed only at the beginning of lambda, case-lambda, let, let-values, let*, let*-values, letrec, letrec-values, fluid-let, let-macro, let-id-macro, let-expansion-time, parameterize, and with-handlers begin expressions are flattened in an internal-definition context (begin) allowed in a top-level, unit, or internal-definition context Removed invoke-open-unit; see the new invoke.ss library, which includes define-values/invoke-unit Self-import is now allowed for unit linking Removed constant-name and constant-name-all-globals Removed secure-primitive-exception-types Removed readable type symbols (e.g., #) Removed semaphore-callback (MrEd now has queue-callback) Removed parameterizations (but not parameters!) parameterize sets parameter values in parallel (like let) instead of in series (like let*) * Changed the initialization of the exception handler in a new thread to use the value of the initial-exception-handler parameter Fixed unfairness in threads (perpetually creating threads would starve certain threads, particularly the main thread) Unreachable thread blocked on an unreachable semaphore is garbage-collectable Added current-memory-use Fixed weak hash table bug (could drop keys too soon) Added optional peek-proc argument to make-input-port Changed TCP writes to block when the underlying implementation blocks, and removed tcp-port-send-waiting? Asynchronous breaks are now disabled during dynamic-wind pre and post thunks Removed user-break-poll-handler; spawn a thread that sleeps and calls break-thread, instead Removed dynamic-enable-break (no long needed since dynamic-wind post thunks can't be broken), but moved it to MzLib's thread.ss Removed exception-break-enabled (now always disabled) Added call-in-nested-thread Removed thread-weight Renamed the call-with-escaping-continution procedure to call-with-escape-continution (call/ec is unchanged) Finished with-continuation-mark and current-continuation-marks and documented them; the errortrace poor man's debugger relies on continuation marks; see plt/collects/errortrace/doc.txt Removed debug-info-handler and replaced the debug-info field with a continuation-marks field Added raise-mismatch-error MacOS: getenv and putenv work within MzScheme; if a file named "Environment" resides in MzScheme's folder, it provides the initial environment; see the documentation for details MacOS: fixed TCP problems Fixed read-write invariance for inexact (floating-point) numbers Changed handling of inexact can complex numbers towards compliance with Brad Lucier's proposal: (* 0 x) = 0 for all x (log 1) = 0, etc. -0.0 and 0.0 are properly distinguished; (- 0.0) = -0.0, and (/ (expt 2 400) -inf.0) = -0.0; (eqv? 0.0 -0.0) = #f even though (= 0.0 -0.0) = #t Complex numbers can have an inexact real/imaginary part with an exact zero imaginary/real part; thus, 4.0 is different from 4.0+0.0i, and 0+4.0i is different from 0.0+4.0i; note that (sqrt -4.0) is 0+2.0i Complex numbers can have a +nan.0 real/imaginary part with an imaginary/real part that is not +nan.0 All zero-length vectors are eq Vectors are written (but not displayed) using the Chez-style #n(...) shorthand by default; added print-vector-length parameter * The value of a built-in procedure is eq across namespaces Replaced require-library-use-compiled with use-compiled-file-kinds Changed interface for wills: no current executor, register-will -> will-register, will-executor-try -> will-try-execute, added will-execute MzLib cleanup: Removed `@' suffix for embedded units in mzlib:core@ and mzlib@ Removed all c.ss libraries, plus constan[t].ss Removed catch-errors and let-enumerate from macro.ss Removed make-class and make-class* from compat.ss Removed zsin, zcos, ztan, zasin, zacos, zatan, zlog, zexp, and zsqrt from zmath.ss (MzScheme's built-ins do complex) Moved from functio.ss to thread.ss: dynamic-disable-break, make-single-threader Removed from functio.ss: dynamic-wind/protect-break Added to thread.ss: dynamic-enable-break Moved MzLib's compat.ss out of the core Removes all but the first two arguments to pretty-print (the rest have parameters, which are more convenient anyway) Changed require to reference-file in refer.ss file.ss library: added make-directory* pretty-print: default display string handler is now the default port display handler instead of the display procedure Ported to BeOS Ported to OSKit Ported to LinuxThreads, sortof; semaphore-waiting threads cannot be broken or killed Inside MzScheme: new built-in type: scheme_complex_izi_type Inside MzScheme: changed scheme_eval_string to raise an exception if the expression returns multiple values, and added scheme_eval_string_multi Version 53, July 25, 1998 Changed file-modify-seconds to file-or-directory-modify-seconds Changed rename-file to rename-file-or-directory Changed file procedures to return void on success and raise and exception on failure: delete-file, rename-file-or-directory, file-size, copy-file, make-directory, delete-directory Changed the procedures file-or-directory-modify-seconds and file-or-directory-permissions to raise an exception if the file/directory does not exist Changed current-drive to raise exn:misc:unsupported on platforms other than Windows Added find-system-path Fixed expand-defmacro for initialization argument expressions in a class*/names form Fixed call/ec bug related to dynamic-wind (see !!! in tests/basic.ss) Fixed dynamic-wind bug: multiple levels of pre-thunks for a jump into a continuation were evaluated in reverse order Fixed atan: second argument is allowed to be an exact non-integer Fixed equal?: comparisons on equivalent vectors or structs with cycles no longer crash (until MzScheme runs out of memory) Added make-temporary-file to MzLib's file.ss Changed random and random-seed to use a parameter-specified random number generator; the generator is initially seeded with a number based on (current-milliseconds) Removed the obsolete MzLib trigger library Added with-continuation-mark and current-continuation-marks, but these have not yet been documented because their semanticses are not yet finalized Version 52, May 25, 1998 R5RS non-compliance reduced to macros Added scheme-report-environment, null-environment, and interaction-environment Changed reference-library, etc. to require-library and changed require-library, etc. to require-library/proc Changed uq-ivar and uq-make-gerenric to ivar/proc and make-generic/proc current-directory is now a parameter Added simplify-path Changed execute and execute* to exit via the exit handler Top-level definitions are no longer allowed in the branches of an if expression; consider replacing an expression like (if ... (define x ...)) with (if ... (global-defined-value 'x ...)) expand-defmacro now signals the same set of syntax errors as compile and eval local-expand-defmacro no longer expands define expressions in a non-top-level context; to implement a macro that detects define forms, use local-expand-body-expression Fixed bug in (let/ec a (let/ec b (let/cc k ...))); calling b then k then a would fail, jumping to b instead of a Fixed read-eval-print loop when jumping to the continuation of a previous eval and raising an exception there before the evaluation finishes regexp-replace and regexp-replace*: \$ ("\\$" in Scheme) is now replaced by the empty string; this allows forms like "\\0\\$3", which inserts the 1st submatch and "3" Fixed a potential bug with continuations (although I never saw it happen); they need to be marked by the GC with interior pointer marking Changed read-line to break lines only on #\newline by default; new optional argument roughly parameterizes over the line-breaking character(s) Add read-string and read-string! for reading a block of characters from a port Changed MzLib's read-string and read-string-all to read-from-string and read-from-string-all Changed MzLib's with-semaphore to return the value returned by the thunk. Added the command-line macro to MzLib's cmdline.ss Linux and FreeBSD: turned on support for using more than 256 file descriptors Inside MzScheme: current-directory, now a parameter, no longer sets the current directory as managed by the OS Inside MzScheme: scheme_split_pathname changed Inside MzScheme: scheme_setcwd and scheme_getcwd renamed to scheme_os_setcwd and scheme_os_getcwd; these set and get the OS-managed cwd, but they have no effect on the current directory seen by Scheme code Version 51, March 25, 1998 Changed load/use-compiled: searches for .zo files in a "compiled/" subdirectory, and searches for .so/.dll files in (build-path "compiled" (system-library-subpath)) Changed load and current-load/default-load-handler: `load' now sets the current-load-relative-directory, so a load handler does not need to set this parameter Added current-load-extension (load-extension handler) Unix: fixed file-or-directory-permissions for group-based permissions when the group is not the current group (but still includes the user) Windows: fixed directory-exists? et al. for UNC paths Added local-expand-body-expression Removed input-port-post-semaphore; this procedure can be implemented using thread, peek-char, and semaphore-post Fixed thread: thunk can return any number of values Fixed custodian-shutdown-all: if it has to shutdown the current thread, it does so immediately instead of waiting for the next thread context switch Fixed will executors: will can return multiple values Added link-exists? Added copy-file Added path-list-string->path-list Added collection-path The delete-file and rename-file functions now reliably work on links rather than the destination of the link (now fixed for MacOS and documented this way) Fixed rename-file: works for directories too, but the destination file/directory cannot exist already. Added a new mode flag for open-output-file et al.: 'truncate/replace tries 'truncate then 'replace Changed initial setting of current-library-collection-paths Unit definitions and embedded definitions are not allowed to shadow syntax or macro names; this restriction resolves all potential ambiguity resulting from shadowing syntax Changed display for symbols containing special characters: the special characters are not escaped (or bar-quoted) Changed write to use the value of (read-accept-bar-quote) for printing symbols containing special characters; if bar qute reading is off, it is turned off for printing, too Fixed unit/sig: correctly handles syntax where definitions in the unit shadow syntactic forms Fixed round of exact rational n/d in the case when (odd? d) and (= (remainder n d) (quotient d 2)) Extended exp, sin, cos, tan, log, asin, acons, atan to complex numbers; changed sqrt to choose the root with a positive real part Removed rectangular <, >, <=, >= for complex numbers Changed storage of loaded-library table from built into the `require-library' procedure to built into the current namespace Added require-relative-library Fixed error messages for +, -, etc. to show all arguments Fixed format, fprintf, and printf: "~~" allowed at the end of the format string Fixed with-handlers: predicate procedures are evaluated with the same exception handler as a handler procedure Added send-event, currently only supported for MacOS Changed MzLib's pconver.ss libraries; the print-convert-hook@ unit was removed (along with the pchookr.ss library) and replaced with parameters defined in pconverr.ss for similar (more powerful) hooks. Fixed interfaces for compiled-file (.zo) loading across MzScheme startups Fixed bug in ports returned by make-pipe that caused spurious eofs Unused interned symbols are now garbage-collected Added support for single-precision floating points (turned off in default compilation) Changed read-eval-print-loop, removing its cooperation with the default error escape handler; instead, it installs its own error escape handler Improved the support for dynamic extensions that gives an error if an extension is already loaded, or calls a reloading function provided by the extension (scheme_reload) Unix images: removed constraint against using stdio before dumps, but images are disabled by default. Also added read-image-from-file procedure MzLib functio.ss: added remv*, remq*, remove*, filter, assf, memf, empty, and empty? MzLib file.ss: added remove-directory/files MzLib constan.ss: added constant-signature-content macro MzLib pconver.ss: added whole/fractional-exact-numbers and empty-list-name MzLib pretty.ss: added pretty-print-show-inexactness MzLib compile.ss: changed the set of compilation flags Removed begin-expansion-time Moved begin-elaboration-time from MzLib into MzScheme Added MzLib library traceld.ss MacOS: MzScheme always prompts for extra arguments, even if a file is dragged onto the application or a launcher program starts it MacOS: Fixed problems with inexact arithmetic: inexact->exact for certain negative numbers and miscellaenous inf.0 and nan.0 problems Windows: CYGWIN32 gcc compiler now supported Inside MzScheme: scheme_setjmp and scheme_longjmp now work on values of type mz_jmp_buf instead of jmp_buf Inside MzScheme: scheme_apply_multi and scheme_apply were reversed! (The _ forms where ok.) Upgraded to gc 4.13alpha1 Version 50, August 26, 1997 Added compile-time inferrence of names for closures, classes, and units to improve error messages Added inferred-name Added file-size Added write-image-to-file for creating heap images of a MzScheme program Fixed reader to disallow . in vectors: #(1 . 2) or #(1 . (3)) Removed global-defined-signature Fixed string->number: explicit radix in string can override radix argument Bug fixed in call/cc related to dynamic-wind (see !!! in tests/basic.ss) Fixed weak hash table's accumulation of hashing buckets Added 'empty flag for make-namespace Added two-argument form for global-defined-value Added system-library-subpath Changed standalone mzscheme to return -1 if a loaded file or evaluated expression returns an error without the rep Refined error messages Version 49, May 31, 1997 Multiple superclass inheritance is no longer supported Added (Java-ish) interfaces to object system class* syntax changed to accommodate interfaces and removed multiple superclasses uq-ivar always takes two arguments; class is not a legal argument uq-make-generic accepts a class or an interface Object system exceptions changed Added custodian system Embedded define conventions changed: "regular" defines are only allowed in begin expressions and the branches of an if; embedded defines can appear in a begin0 expression, but not in the first position; defines must all appear at the beginning of the block Contents of a begin expression as an immediate unit or unit/sig expression are promoted to immediate expressions case supports only R4RS syntax; a single non-list "datum" is no longer allowed Removed catch; use let/ec instead Removed vector-append Removed load-with-cd (use load/cd) Added load/use-compiled Added current-load-directory parameter (set by the default load handler while loading a file) and load-relative (uses the parameter for loading a relative filename) unit/sig's include form is like load-relative instead of load/cd require-library uses load or load/use-compiled instead of load/cd Windows: expand-path does not put a drive on a driveless path anymore; use path->complete-path instead compile-file moved out of MzScheme into MzLib "compile.ss"; now takes a single flag list argument instead of two final Booleans current-base-parameterization parameter replaced with parameterization-branch-handler parameter Parameterizations support sharing (in addition to defaulting); see docs for make-parameterization-with-sharing Added print, port print handlers, and a global port print handler Changed the default print handler to use print instead of write Fixed bug in ports returned by make-pipe Fixed bug in dynamic-wind; continuation jumps into the pre-thunk had a non-intuitive semantics; the correct semantics is now implemented and documented (also for jumps with the post-thunk) Changed time-apply to always return a list as its first return value; time form can return multiple values for its expressions format, fprintf, and printf are case-insensitive for ~ directives; added ~v, ~e, ~ Added semaphore-wait/enable-break Added thread-running? and thread-wait Fixed bug in threads and timed sleeping Fixed bug in breaking a blocked thread Fixed bug in continuations returning multiple values through a dynamic-wind (multiple return values could be corrupted) Fixed arity reporting for continuations Fixed Windows system* and read from console stdin and process* ports: MzScheme threads no longer blocked; ctl-c breaking works in stand-alone console MzScheme process and process* now return a list of 5 values (instead of 4) map, for-each, andmap, and ormap raise exn:application:map-arity when the procedure's arity does not match the number of supplied lists; note that (map (lambda () 10) null) now signals an error list-ref and list-tail accept arbitrarily large indices Type for indices changed: must be an exact integer (matches R4RS better) affects make-vector, vector-ref, vector-set!, make-string, string-ref, string-set!, substring, and struct-ref make-namespace's '[no-]set!-undefined and '[no-]auto-else flags removed; replaced with two new parameters: compile-allow-set!-undefined and compile-allow-cond-fallthrough Fixed in units: (define x y) (define y 0) x => # instead of # exn:struct's super-type field renamed struct-type for consistency exn:i/o:filesystem:filename split into exn:i/o:filesystem:path and exn:i/o:filesystem:file; username exception moved under path Unix: system no longer blocks other MzScheme threads Unix: processes created by process and process* are not zombies forever, anymore. (The SIGCHLD signal is handled appropriately.) MacOS: dynamic extension suopport via CFM (PPC only in the distributed applications from PLT) Windows: removed attempted fix for thread-blocking problem when reading stdin from console Fixed auto-flush of stdout for read of stdin Fixed <, >, <=, >= for certain exact rational number comparisons Fixed inexact->exact for negative inexact numbers (fractional part was added to the resulting number with the wrong sign) Fixed rational? to answer #t for inexact numbers Fixed odd?, even?, and trig functions for +inf.0 and -inf.0 Fixed handling of +nan.0 by many math routines; fixed +nan.0 for everything under Windows Added R4RS rationalize compound-unit/sig export var clause syntax now matches documentation Added require-library-use-zo Moved cons? and last-pair into functio.ss instead of compat.ss Library system generalized to supoprt multiple collections; current-library-path replaced with current-library-collection-path require-library now returns the result of the loaded library Removed load-recent from MzLib's file.ss; use load/use-compiled instead Added reference-library, "refer.ss" [core], "XXXr.ss" MzLib libraries Added build-string, build-vector, build-list, loop-until to MzLib's functio.ss Added thread.ss MzLib library [core] Added inflate.ss MzLib library Moved synrule.ss out of core Fixed MzLib's stringu.ss to not use macro.ss Updated MzLib's spidey.ss, added it to core Removed define-some, define-virtual-struct, define-struct-tree from MzLib's macro.ss begin-expansion-time returns the value of the last expression set-thread-weight! replaced with 2-argument thread-weight Inside MzScheme: changed class/object toolbox, added custodian toolbox Upgraded to gc 4.11 Version 48: Skipped to avoid confusion with Scheme48 Version 47, January 11, 1997 WARNING: multiple inhertance is going away in the next version or so Added will executors pretty-print-print-hook and pretty-print-size-hook now take three arguments: value display? port file-position can return the current position for any port Fixed errors reading floating-point constants due to system library bugs: Linux: strtod("0e...", ...) quits looking after "0" SunOS/Solaris: strtod(".3e2666666666") returned 0.0 HP/UX: strtod(".3e2666666666") fails Windows: fixed thread-blocking problem for reading stdin from console Insize MzScheme: when working with "fd_set" values, use MZ_FD_ZERO, MZ_FD_SET, MZ_FD_CLR, MZ_FD_ISSET; use scheme_get_fdset() to get the second or third fd_set in an array; routines for thread-blocking are now documented in "Inside MzScheme" Version 46, December 5, 1996 unit/sig macros moved out of MzLib and into core MzScheme; (require-library "unitsig.ss") is obsolete, but still supported as a no-op Unit signature matching is now position-independent, and the error messages are better Removed obsolete install-unit-with-signature (begin) or (begin0) is now a syntax error Changed class* syntax so that an explicit name for `this' is provided MzLib's class-asi* changed to class*-asi, while adding new `this' id Prettier(?) printing for prims like >: #<|primitive:>|> invoke-open-unit w/o path/prefix is now the same as #f instead of (); the path form will probably be phased out in a future release quasiquote syntax changed slightly stdout/stderr are not auto-flushed for read-char or peek-char on stdin (still flushed by read and read-line) Added port-display-handler and port-write-handler Version 45, November 12, 1996 Multiple return values are aggressively supported IMPORTANT: let-values is now analogous to let; the old let-values is now let*-values let-values, letrec-values, define-values, and begin0 are primitive define-struct and let-struct expand to new struct form Added thread-savy parameterization system; namespace system changed pipe changed to make-pipe, returns 2 values Case-sensitivity for the reader is a settable parameter Reading [] and {} as parens is a settable parameter class* syntax extended to allow local renaming of public ivars delay/force support multiple values else and => in cond and else are now "scoped" normalize-path from MzLib signals an error for bad paths Windows: build-path can join a drive to a (driveless) absolute path and //machine/disk drive names are supported; also fixed file-system-root-list Added complete-path? and current-drive (for Windows) Fixed (begin (values ...) ...) and (begin0 (values ...) ...) Fixed comparisons between inexact and exact when the exact to inexact conversion results in overflow or underflow, and fixed (exact->inexact (/ X Y)) and (/ +inf.0 X), etc. when X & Y are larger than the largest floating-point, fixed modulo, remainder, quotient for infinities Fixed TCP problems (Unix, Windows) and implemented for MacOS Fixed dynamic-loading to always search from current directory Fixed real process idling for a timed sleep Fixed file read/write exceptions (write exceptions now raised) Fixed quasiquote bug with ,@ and unquoting depth Fixed filesystem-root-list for Windows Fixed dynamic-wind when a continuation is invoked from the post-thunk Fixed continuations for re-entry of a continuation that is mulitply-invoked Fixed string->number with leading spaces; e.g., (string->number " 1") invoke-unit import variable restriction removed (locals are allowed) (case-lambda) is now legal \ escapes & and \ in regexp-replace replacement string Added regexp-replace* Added port-read-handler Inside MzScheme: Changed use of scheme_sleep Inside MzScheme: Changed primitive unit init func arguments Inside MzScheme: Changed primitive accessing of unit boxes and environment boxes Inside MzScheme: Revoked syntax extensibility Reimplemented the core interpreter (chained closures -> flattened) Version 44, September 9, 1996 load, load/cd return value of last loaded expression scheme_load returns Scheme_Object* or NULL Built-in TCP support (Not MacOS, yet) unit clauses macro-expanded before checking `define' keywords Better dynamic extension handling and compilation support Fixed read blocking threads in FreeBSD Extensions' scheme_initialize must return Scheme_Object* scheme_sleep has internal default for basic sleeping, installed by scheme_basic_env if scheme_sleep is still NULL Unix/Winsock: fds arg for needs_wakeup and scheme_sleep expanded for writes and exceptions Fixed quotient for inexact numbers Fixed bug comparing a bignum rational with a fixnum rational Fixed startup crash when PATH env variable is slightly bad Sped up thread switching for Mac Sped up thread switching for most Unix for a small number of threads Upgraded to gc 11alpha3 Version 43 re-released August 12, 1996 with libguile Version 43, August 9, 1996 "functor" -> "unit" signed units added to and used by mzlib (sigfunctors gone) Made .zo files smaller and faster to load Use 64-bit fixnums for Alpha system, system*, process*, and execute* supported for Windows Fixed memory bug in printing hexadecimal Fix bug in modulo Better floating-point control for infinity, nan results on many platforms Version 42: June 8, 1996 Functor system added Fixed (cond (1)), etc. Fixed type-checking for numerical comparisons; e.g., (< 2 1 'a) Fixed dynamic-wind and call/ec for values Fixed read for strings containing #\nul Non-matching cond/case raises an error Made string=?, char=?, etc. multi-arity like numerical =, etc. Changed definition of time-apply (returns values, now) MzScheme threads can almost be real OS threads under Solaris, but more work is needed to guarantee safety for the symbol table and globals. More thread systems to follow. spawn-eval replaced by make-eval thread-input-port, thread-output-port, and thread-error-port removed binary-and, etc. replaced with 2's complement bitwise-and, etc. Fixed writing compiled quoted graph expressions Fixed return value of system test.scm expanded and broken into multiple files: (load/cd "tests/all.ss") Version 0.41: April 15, 1996 Revised class syntax; see the manual Exception system added; primitive errors raise exceptions defmacro replaced by define-macro Added define-id-macro Fixed let-macro shadowing local vars Improved error messages; error-print-width Fixed stack checking for Win32 '. no longer allowed unquote and unquote-splicing now defined at top level equal? supports boxes Version 0.40: March 24, 1996 structure:X => struct:x mzlib path uses MZLIB or PLTHOME environment variables Version 0.39: March 6, 1996 Fixed expand-defmacro for (lambda () (and)) et al. Fixed sqrt on complex numbers; coefficients were reversed Cleaned up read and display/write to handle C stack overflow Arity checking bug fixed for arity 0 Pretty-print is parameterized by depth Version 0.38: February 22, 1996 Fixed bug in compiling frame-sharing; e.g., (let ([d 0]) ((car (cons (let ([a 4]) (lambda () a)) (let ([b 7]) b))))) returned 7 instead of 4 Fixed bug in closing port by call-with-input-file Fixed magnitude on negative reals Fixed angle on negative reals Fixed cos, sin, etc. on rationals Fixed min and max on rationals with non-rationals Fixed (random 0) Fixed equal? on really long lists Fixed list procedures with arbitrary duration: checking for break Fixed char-X? and characters past ASCII 127 Fixed hash table bug that causes infinite internal loop Fixed bug in reading #| |# comments at the end of a list Filesystem utilities added "processes" are now called "threads"; procedure names changed accordingly eval can return multiple values; r-e-p-l handles correctly Some changes to compilation interface: must set new flag is_proc_closure in compile_info rec scheme_static_distance changed; use flags scheme_sleep() must now take a float current-prompt-read added Console version reads ~/.mzschemerc init file (or mzscheme.rc) NO_STAT compilation flag -> NO_STAT_PROC Version 0.37: unreleased Version 0.36: January 18, 1996 Fixed bug in bignum multiplication Version 0.35: January 17, 1996 current-print added x@y notation supported ~ expanded in pathnames (Unix) Fixed bug parsing #T, etc. Fixed bug parsing hex numbers and others Fixed fp-initialization bug for Win32 Better printing for special symbols Version 0.34: December 30, 1995 Various bignum operations sped up Chez-style symbol parsing supported (escaping \ and quoting |) Version 0.33: December 21, 1995 rationals and complex numbers supported make-class and make-class* syntax changed (one set of parens added). The old syntax is still supported for now, but you should convert. The old syntax will eventually go away (and Zodiac will never be compatible with it). class variables and cvar no longer allowed ivar always takes an object; if class included, must be first threads/processes changed w.r.t. environment used during execution error handler split into erro displayer and error escaper stack limitation of expander/compiler removed expand => expand-defmacro expand-once => expand-defmacro-once user-break-poll => user-break-poll-handler enable-break => break-enabled #% now legal for starting non-keyword symbols full floating-point input format supported Version 0.32: December 4, 1995 Added weak boxes +inf.0, -inf.0, -nan.0, +nan.0 constants added Better checking when using floats as indices (vector-ref, etc.) Better (correct!) hashing procedure Fixed threads in Win32s/WinNT by creating a new stack Fixed bug in spawning new (MzScheme) processes Fixed incorrect process progress (~deadlock) analysis Fixed bug in resizing hash table Fixed bug in read (reading "+", "-", or "." at EOF) Fixed bug in read-number (fractions and forcing; e.g. "../") Fixed bug in open-output-string (> 100 chars gave empty result) Fixed regexp-replace (memory bug) Version 0.31: November 14, 1995 Bignum bigs: subtracting from 0, comparing negative (current-eval) initially returned the wrong procedure tan procedure added putenv S-expression graph reading and printing Version 0.30: October 25, 1995 Added call-with-values and regexp Unix stack-checking setup code fixed Version 0.29: October 18, 1995 Added `arity' procedure Bug fix related to forms such as (let ([x (let ...)]) ...) Verion 0.28: October 3, 1995 Fixed general stack overflow-checking for Unix Verion 0.27: September 26, 1995 Moved compilation flags from the Makefile into "sconfig.h" More general stack overflow-checking (when needed) Computations can overflow the stack and continue Changed command line flags; added -r (or --script) flag Added multiple inheritance and `rename', `share', and `local' declarations Merged Patrick Barta's Windows DLL implementation for `load-extension' Re-implemented `quasiquote', `and', and `or' as a macros Re-implemented let-forms to make small `let's efficient `let*' expands to `let' Made core syntactic form names keywords Added #% keywords Added `hash-table-map' and `hash-table-for-each' Fixed bignum bugs: `eqv?'/`equal?' and `modulo' Fixed inexact bugs: `floor', `ceiling', and `round' Created this "HISTORY" file