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fix #268
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@@ -340,6 +340,10 @@ func NewModeSet() *ModeSet {
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// test whether `mode` is set
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func (set *ModeSet) HasMode(mode Mode) bool {
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if set == nil {
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return false
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}
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set.RLock()
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defer set.RUnlock()
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return set.modes[mode]
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