go/format: go fmt doesn't properly format map[string]int for variable key lengts

[gopherbot]

by erik@dubbelboer.com:

What does 'go version' print?

  go version go1.3.2 linux/amd64

What steps reproduce the problem?
If possible, include a link to a program on play.golang.org.

  1. http://play.golang.org/p/PfpjQr6LrC
  2. Press Format or run `go fmt` on the source.

What happened?

  The map is formatted quite weirdly and not nice at all.

What should have happened instead?

  The source should be formatted nicely.

[ianlancetaylor]

Comment 1:

Labels changed: added repo-main, release-none.

[griesemer]

Comment 2:

This is working as intended. It's a variation of issue #7335. See that one for an
explanation.

Status changed to WorkingAsIntended.