spec: add example showing missing return statement Will help people find the rules by searching the spec by having a comment saying "missing return"; "terminating statement" does not evoke the rule to the uninitiated.
spec: add example showing missing return statement
Will help people find the rules by searching the spec by
having a comment saying "missing return";
"terminating statement" does not evoke the rule to the
uninitiated.

R=golang-dev, rsc
CC=golang-dev
https://codereview.appspot.com/7838044
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go