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fix code typo
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@ -163,9 +163,6 @@ type Memo struct {
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// Get is concurrency-safe.
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func (memo *Memo) Get(key string) (value interface{}, err error) {
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res, ok := memo.cache[key]
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if !ok {
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res.value, res.err = memo.f(key)
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memo.cache[key] = res
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memo.mu.Lock()
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res, ok := memo.cache[key]
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