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x/tools/imports: remove unused type gate.
Found with honnef.co/go/tools/cmd/unused. Change-Id: I3e40d58044c250bfeafc77e5eef4533390ace12b Reviewed-on: https://go-review.googlesource.com/37607 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -378,12 +378,6 @@ func (s byImportPathShortLength) Less(i, j int) bool {
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}
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func (s byImportPathShortLength) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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// gate is a semaphore for limiting concurrency.
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type gate chan struct{}
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func (g gate) enter() { g <- struct{}{} }
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func (g gate) leave() { <-g }
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var visitedSymlinks struct {
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sync.Mutex
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m map[string]struct{}
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