strings, bytes: panic if Repeat overflows or if given a negative count
Panic if Repeat is given a negative count or if the value of (len(*) * count) is detected to overflow. We panic because we cannot change the signature of Repeat to return an error. Fixes #16237 Change-Id: I9f5ba031a5b8533db0582d7a672ffb715143f3fb Reviewed-on: https://go-review.googlesource.com/29954 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org>
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