This page summarizes the changes between tagged releases of Go. For full details, see the Mercurial change log.
++A sizeable release, including standard library improvements and a slew of +compiler bug fixes. The three-week interval was largely caused by the team +preparing for Google I/O. + +* big: add Rat type (thanks Evan Shaw), + new features, much performance tuning, cleanups, and more tests. +* bignum: deprecate by moving into exp directory. +* build: allow MAKEFLAGS to be set outside the build scripts (thanks Christopher Wedgwood). +* bytes: add Trim, TrimLeft, TrimRight, and generic functions (thanks Michael Hoisie). +* cgo: fix to permit cgo callbacks from init code. +* cmath: update range of Phase and Polar due to signed zero (thanks Charles L. Dorian). +* codereview: work better with mq (thanks Peter Williams). +* compress: renamings + NewDeflater -> NewWriter + NewInflater -> NewReader + Deflater -> Compressor + Inflater -> Decompressor +* exp/draw/x11: respect $XAUTHORITY, + treat $DISPLAY the same way x-go-bindings does. +* exp/draw: fast path for glyph images, other optimizations, + fix Rectangle.Canon (thanks Roger Peppe). +* fmt: Scan, Scanln: Start of a simple scanning API in the fmt package, + fix Printf crash when given an extra nil argument (thanks Roger Peppe). +* gc: better error when computing remainder of non-int (thanks Evan Shaw), + disallow middot in Go programs, + distinguish array, slice literal in error messages, + fix shift/reduce conflict in go.y export syntax, + fix unsafe.Sizeof on ideal constants, + handle use of builtin function outside function call, + many other bug fixes. +* gob: add support for maps, + add test for indirect maps, slices, arrays. +* godoc: collect package comments from all package files. +* gofmt: don't lose mandatory semicolons, + exclude test w/ illegal syntax from test cases, + fix printing of labels. +* http: prevent crash if remote server is not responding with "HTTP/". +* json: accept escaped slash in string scanner (thanks Michael Hoisie), + fix array -> non-array decoding. +* libmach: skip __nl_symbol_ptr section on OS X. +* math: amd64 versions of Fdim, Fmax, Fmin, + signed zero Sqrt special case (thanks Charles L. Dorian). +* misc/kate: convert isn't a built in function (thanks Evan Shaw). +* net: implement BindToDevice, + implement raw sockets (thanks Christopher Wedgwood). +* netFD: fix race between Close and Read/Write (thanks Michael Hoisie). +* os: add Chtimes function (thanks Brad Fitzpatrick). +* pkg/Makefile: add netchan to standard package list. +* runtime: GOMAXPROCS returns previous value, + allow large map values, + avoid allocation for fixed strings, + correct tracebacks for nascent goroutines, even closures, + free old hashmap pieces during resizing. +* spec: added imaginary literal to semicolon rules (was missing), + fix and clarify syntax of conversions, + simplify section on channel types, + other minor tweaks. +* strconv: Btoui64 optimizations (thanks Kyle Consalus). +* strings: use copy instead of for loop in Map (thanks Kyle Consalus). +* syscall: implement BindToDevice (thanks Christopher Wedgwood), + add Utimes on Darwin/FreeBSD, add Futimes everywhere, + regenerate syscalls for some platforms. +* template: regularize name lookups of interfaces, pointers, and methods. ++