This is a transcript before this change. I've capitalized the text being removed.
Note that it is always near another line that already says fmt, marked with <<<

$ cd $GOROOT/src/pkg/fmt

$ go test -cover
PASS
coverage FOR FMT: 91.3% of statements
ok  	fmt	0.040s <<<

$ go test -coverpkg strconv
PASS
coverage FOR FMT: 64.9% of statements in strconv
ok  	fmt	0.039s <<<

$ go test -cover -c
$ ./fmt.test -test.covermode=set <<<
PASS
coverage FOR FMT: 91.3% of statements

$ go test -coverpkg strconv -c
$ ./fmt.test -test.covermode=set <<<
PASS
coverage FOR FMT: 64.9% of statements in strconv

That the summary printed by 'go test [options] fmt' is unchanged:

$ go test -cover fmt
ok  	fmt	0.040s	coverage: 91.3% of statements

$ go test -coverpkg strconv fmt
ok  	fmt	0.038s	coverage: 64.9% of statements in strconv

R=r
CC=gobot, golang-dev
https://golang.org/cl/10932045