It's now redundant with checking whether the handle field is nil.
For #70907
Change-Id: I877f2a7c63d15ab5f8e3d2c9aa24776c2e3e2056
Reviewed-on: https://go-review.googlesource.com/c/go/+/638576 Reviewed-by: Robert Griesemer <gri@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
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