time: ParseDuration accepts questionable inputs

[rui314]

What does 'go version' print?
go version devel +2b85dda01af0 Wed Mar 19 10:14:04 2014 -0700 linux/amd64

What steps reproduce the problem?
time.ParseDuration accepts strings containing 2 or more occurrences of the same unit,
such as "3h5h" (= 8 hours). The documentation is not clear whether it's valid
or not. We might want to reject such strings. http://play.golang.org/p/Ay_IEwcA7D

[ianlancetaylor]

Comment 1:

Labels changed: added repo-main, release-go1.4.

Status changed to Accepted.

[gopherbot]

Comment 2:

CL https://golang.org/cl/108120045 mentions this issue.

[josharian]

Comment 3:

I think we should do nothing here. As ruiu notes in CL 108120045, changing this might
break compatibility and the current behavior is fairly harmless. Documenting the
behavior seems like noise.

[rui314]

Comment 4:

As the person who filed this bug, I agree with Josh that we shouldn't do anything for
it. It doesn't worth the risk to break compatibility. If there's no objection I'll close
this bug.

[rui314]

Comment 5:

Status changed to WontFix.