cmd/yacc: always import fmt, safely The parser depends on it but the client might not import it, so make sure it's there. Fixes issue 4038.
cmd/yacc: always import fmt, safely
The parser depends on it but the client might not import it, so make sure it's there.
Fixes issue 4038.

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/6497094

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