They can be modified when the string returned by String no longer exists.
Fixes #68300
Change-Id: I526a068151f7aad1ab6827504b51a84e7399cafe
Reviewed-on: https://go-review.googlesource.com/c/go/+/596955 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Than McIntosh <thanm@google.com>
Commit-Queue: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
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