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If an interface contains a blank method, that's already an error. No need for useless follow-up error messages about not implementing them. Fixes #42964. Change-Id: I5bf53a8f27d75d4c86c61588c5e2e3e95563d320 Reviewed-on: https://go-review.googlesource.com/c/go/+/275294 Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>