This page summarizes the changes between tagged releases of Go. For full details, see the Mercurial change log.
++weekly.2011-04-13 + +This weekly snapshot includes major changes to the reflect package and the +os.Open function. Code that uses reflect or os.Open will require updating, +which can be done mechanically using the gofix tool. + +The reflect package's Type and Value types have changed. Type is now an +interface that implements all the possible type methods. Instead of a type +switch on a reflect.Type t, switch on t.Kind(). Value is now a struct value +that implements all the possible value methods. Instead of a type switch on a +reflect.Value v, switch on v.Kind(). See the change for the full details: + http://code.google.com/p/go/source/detail?r=843855f3c026 + +The os package's Open function has been replaced by three functions: + OpenFile(name, flag, perm) // same as old Open + Open(name) // same as old Open(name, O_RDONLY, 0) + Create(name) // same as old Open(name, O_RDWR|O_TRUNC|O_CREAT, 0666) + +To update your code to use the new APIs, run "gofix path/to/code". Gofix can’t +handle all situations perfectly, so read and test the changes it makes before +committing them. + +Other changes: +* archive/zip: add func OpenReader, type ReadCloser (thanks Dmitry Chestnykh). +* asn1: Implement correct marshaling of length octets (thanks Luit van Drongelen). +* big: don't crash when printing nil ints. +* bufio: add ReadLine, to replace encoding/line. +* build: make the build faster, quieter. +* codereview: automatically port old diffs forward, + drop Author: line on self-clpatch, + recognize code URL without trailing slash. +* crypto/block: remove deprecated package. +* crypto/des: new package implementating DES and TDEA (thanks Yasuhiro Matsumoto). +* crypto/ecdsa, crypto/rsa: use io.ReadFull to read from random source (thanks Dmitry Chestnykh). +* crypto/rsa: add 3-prime support, + add support for precomputing CRT values, + flip the CRT code over so that it matches PKCS#1. +* crypto/x509: expose complete DER data (thanks Mikkel Krautz). +* doc: new "Functions" codewalk (thanks John DeNero). +* doc/roadmap: add sections on tools, packages. +* fmt: allow %U for unsigned integers. +* gc: fixes and optimizations. +* go/printer, gofmt: use blank to separate import rename from import path. +* go/scanner: better TokenString output. +* go/types: new Go type hierarchy implementation for AST. +* godashboard: show packages at launchpad.net (thanks Gustavo Niemeyer). +* gofix: add -diff, various fixes and helpers. +* gotest: fix a bug in error handling, + fixes for [^.]_test file pattern (thanks Peter Mundy), + handle \r\n returned by gomake on Windows (thanks Alex Brainman). +* gotype: use go/types GcImporter. +* govet: make name-matching for printf etc. case-insensitive. +* http: allow override of Content-Type for ServeFile, + client gzip support, + do not listen on 0.0.0.0 during test, + flesh out server Expect handling + tests. +* image/ycbcr: new package. +* image: allow "?" wildcards when registering image formats. +* io: fixes for Read with n > 0, os.EOF (thanks Robert Hencke). +* ld: correct Plan 9 compiler warnings (thanks Lucio De Re), + ELF header function declarations (thanks Lucio De Re), + fix Mach-O X86_64_RELOC_SIGNED relocations (thanks Mikkel Krautz), + fix Mach-O bss bug (thanks Mikkel Krautz), + fix dwarf decoding of strings for struct's fieldnames (thanks Luuk van Dijk), + fixes and optimizations (25% faster). +* log: generalize getting and setting flags and prefix. +* misc/cgo/life: enable build and test on Windows (thanks Alex Brainman). +* misc/vim: add plugin with Fmt command (thanks Dmitry Chestnykh), + update type highlighting for new reflect package. +* net: disable multicast tests by default (thanks Dave Cheney), + sort records returned by LookupMX (thanks Corey Thomasson). +* openpgp: Fix improper := shadowing (thanks Gustavo Niemeyer). +* os: rename Open to OpenFile, add new Open, Create, + fix Readdir in Plan 9 (thanks Fazlul Shahriar). +* os/inotify: use _test for test files, not _obj. +* pkg/path: enable tests on Windows (thanks Alex Brainman). +* reflect: new Type and Value API. +* src/pkg/Makefile: trim per-directory make output except on failure. +* syscall: Add DT_* and MADV_* constants on Linux (thanks Albert Strasheim), + add Mmap, Munmap on Linux, FreeBSD, OS X, + fix StartProcess in Plan 9 (thanks Fazlul Shahriar), + fix Windows Signaled (thanks Alex Brainman). +* test/bench: enable build and test on Windows (thanks Alex Brainman). ++