test: test that x := <-c accepts a general expression
test: test that x := <-c accepts a general expression

The gccgo compiler used to fail to parse this.

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/5610051

gnanderson/go,tv42/old-go,dsriram/golang,dsriram/golang,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,pombredanne/go-deleteme,dsriram/golang,pombredanne/go-deleteme,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,dsriram/golang,apparentlymart/golang,tv42/old-go,tv42/old-go,dsriram/golang,gnanderson/go,apparentlymart/golang,gnanderson/go,tv42/old-go,dsriram/golang,dsriram/golang,apparentlymart/golang,apparentlymart/golang,gnanderson/go,apparentlymart/golang,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,gnanderson/go,pombredanne/go-deleteme,gnanderson/go