testing: exit during example test is mysterious

[rsc]

If an Example test prints to standard error and then exits, standard error is buffered
so it doesn't show up. The test just exits. This is VERY confusing.

One fix would be to not include standard error in the matched output.

[adg]

Comment 1:

I think the proposed fix is a fine one. I don't see any examples in the standard library
that print to standard error for anything other than error conditions.

Status changed to WaitingForReply.

[adg]

Comment 2:

Status changed to Started.

[adg]

Comment 3:

Sent CL: https://golang.org/cl/6973048

[adg]

Comment 4:

This issue was closed by revision ff5d47e.

Status changed to Fixed.