• Martin Garton's avatar
    bufio: make Reader.Peek invalidate Unreads · e51b19a9
    Martin Garton authored
    Since Reader.Peek potentially reads from the underlying io.Reader,
    discarding previous buffers, UnreadRune and UnreadByte cannot
    necessarily work.  Change Peek to invalidate the unread buffers in all
    cases (as allowed according to the documentation) and thus prevent
    hiding bugs in the caller.
    
    (This change was previoiusly merged and then reverted due concern about
    being too close to a release)
    
    Fixes #18556
    
    Change-Id: I9027d75aa834d4b27703f37711ba25de04d89f3c
    GitHub-Last-Rev: 917ef1e51131d734f92efc946a0ab5ca4ff69be6
    GitHub-Pull-Request: golang/go#28768
    Reviewed-on: https://go-review.googlesource.com/c/149297
    Run-TryBot: Ian Lance Taylor <iant@golang.org>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: 's avatarIan Lance Taylor <iant@golang.org>
    e51b19a9
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