time: playground doesn't crash on Reset of zero time.TImer

[bradfitz]

This program crashes at Go 1.3 and Go tip (to be 1.4), but doesn't crash on the Go 1.3
playground:

https://play.golang.org/p/earSjQISp8

Instead, it ends successfully.

That led a reporter on golang-dev to conclude that it should work outside of the
playground.

Perhaps Reset, etc should panic if the Timer's runtimeTimer is zero.

Or it should work outside of the playground.

Or be documented as-is.

[bradfitz]

Comment 1:

The original reporter of this bug has additional feedback at
https://groups.google.com/forum/#!topic/golang-dev/Dhv4g-PWuho but doesn't have a Google
account to post it here.

[bradfitz]

Comment 2:

OP has filed issue #8776 for the non-playground bug

[griesemer]

Comment 3:

Addressed issue #8776 (better documentation). Should verify that behavior is consistent
once we upgrade the playground's runtime.

[dvyukov]

Comment 4:

Issue #8967 has been merged into this issue.

[gopherbot]

Comment 5:

CL https://golang.org/cl/155620045 mentions this issue.

[bradfitz]

Comment 6:

This issue was closed by revision ab4af52.

Status changed to Fixed.

[rsc]

Comment 7:

Note that if you want a stopped channel timer you can restart with Reset, just use
t := time.NewTimer(0)
t.Stop()
to set it up.