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Use ContainsRune
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@ -341,7 +341,7 @@ func (l *lexer) ignore() {
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// accept consumes the next rune if it's from the valid set.
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func (l *lexer) accept(valid string) bool {
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if strings.IndexRune(valid, l.next()) >= 0 {
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if strings.ContainsRune(valid, l.next()) {
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return true
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}
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l.backup()
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@ -350,7 +350,7 @@ func (l *lexer) accept(valid string) bool {
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// acceptRun consumes a run of runes from the valid set.
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func (l *lexer) acceptRun(valid string) {
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for strings.IndexRune(valid, l.next()) >= 0 {
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for strings.ContainsRune(valid, l.next()) {
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// consume
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}
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l.backup()
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