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

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang