49543695c5
This allows callers to invoke f.Usage() themselves and get the default usage handler instead of a panic (from calling a nil function). Fixes #16955. Change-Id: Ie337fd9e1f85daf78c5eae7b5c41d5ad8c1f89bf Reviewed-on: https://go-review.googlesource.com/31576 Run-TryBot: Russ Cox <rsc@golang.org> Reviewed-by: Rob Pike <r@golang.org> |
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