Very few of the compiler regression tests include a comment
saying waht they do. Many are obvious, some are anything but.
I've started with a-c in the top directory. More will follow once
we agree on the approach, correctness, and thoroughness here.
zerodivide.go sneaked in too.
R=rsc, r
CC=golang-dev
https://golang.org/cl/5656100
const2.go:7:9: error: expected '='
Uses '.' to recognize the quotation marks, as the actual
characters printed depend on the user's locale.
R=rsc
DELTA=1 (0 added, 0 deleted, 1 changed)
OCL=26360
CL=26373