This is more correct with respect to garbage collection.
I don't know of any specific failures it could cause today.

Change-Id: I7eed6a06d2f281051199e79e4a9913aa8360ded7
Reviewed-on: https://go-review.googlesource.com/14137Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>