Tools:
cmd/dist: use clang on FreeBSD (https://golang.org/cl/16635)
cmd/go: vendoring enabled by default (https://golang.org/cl/13967/)
cmd/go: flags for tests must precede package name if present; also makes it easier
to pass flags to test binaries (https://golang.org/cl/14826)
cmd/go: add -msan option (https://golang.org/cl/16169)
cmd/compile: add -msan option (https://golang.org/cl/16160)
cmd/link: add -msan option (https://golang.org/cl/16161)
cmd/cgo: fix C.complexfloat and C.complexdouble and treat as separate types from
complex64 and complex128 (https://golang.org/cl/17208)
cmd/cgo: new pointer passing rules defined and enforced
(https://golang.org/issue/12416)
Ports:
Add new experimental ports for linux/mips64 and linux/mips64le: no cgo, external
linking or disasm yet (https://golang.org/cl/14460 and others)
NaCl is no longer restricted to pepper_41 (https://golang.org/cl/13958/)
Reflect change:
cmd/compile/internal/gc: make embedded unexported structs RO
(https://golang.org/cl/14085)
encoding/json: check for exported fields in embedded structs
(https://golang.org/cl/14011)
encoding/xml: check for exported fields in embedded structs
(https://golang.org/cl/14012)
reflect: adjust access to unexported embedded structs
(https://golang.org/cl/14010)
API additions and behavior changes:
bufio: add Scanner.Buffer (https://golang.org/cl/14599/)
bufio: add ErrFinalToken as a sentinel value for Scan's split functions
(https://golang.org/cl/14924)
crypto/aes: dedicated asm version of AES-GCM (https://golang.org/cl/10484)
fmt: allow any integer type as an argument to the * operator
(https://golang.org/cl/14491/)
fmt: in Scanf, newlines must match even at end of string
(https://golang.org/cl/16165/)
image: add NYCbCrA types (https://golang.org/cl/15671)
math/rand: add Read (https://golang.org/cl/14522)
net/http: HTTP/2.0 support (many CLs)
net/url: make *url.Error implement net.Error (https://golang.org/cl/15672)
path/filepath: Join("c:", "a") now returns `c:a` instead of `c:\a` on windows
(https://golang.org/cl/17470)
runtime: only one goroutine in traceback (https://golang.org/cl/16512) maybe
runtime: best-effort detection of concurrent misuse of maps
(https://golang.org/cl/17501)
strconv: QuoteToGraphic (https://golang.org/cl/14184/)
text/template: ExecError (https://golang.org/cl/13957/)
text/template: trimming spaces (https://golang.org/cl/14391/)
text/template: Funcs check names (https://golang.org/cl/14562/)
text/template: IsTrue (https://golang.org/cl/14562/)
text/template: blocks and permit redefinition (https://golang.org/cl/14005)
time: allow one and two-digit days of the month during Parse
(https://golang.org/cl/14123/)