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encoding/csv: remove unused unreadRune function
R=golang-dev, rsc CC=golang-dev https://golang.org/cl/37720046
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@ -193,12 +193,6 @@ func (r *Reader) readRune() (rune, error) {
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return r1, err
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}
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// unreadRune puts the last rune read from r back.
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func (r *Reader) unreadRune() {
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r.r.UnreadRune()
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r.column--
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}
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// skip reads runes up to and including the rune delim or until error.
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func (r *Reader) skip(delim rune) error {
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for {
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