remove unnecessary `Default` bound from `Hash{Map,Set}`'s `Extend` impl
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@ -1508,7 +1508,7 @@ impl<K: Eq + Hash<S>, V, S, H: Hasher<S> + Default> FromIterator<(K, V)> for Has
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}
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#[stable]
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impl<K: Eq + Hash<S>, V, S, H: Hasher<S> + Default> Extend<(K, V)> for HashMap<K, V, H> {
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impl<K: Eq + Hash<S>, V, S, H: Hasher<S>> Extend<(K, V)> for HashMap<K, V, H> {
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fn extend<T: Iterator<Item=(K, V)>>(&mut self, mut iter: T) {
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for (k, v) in iter {
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self.insert(k, v);
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@ -605,7 +605,7 @@ impl<T: Eq + Hash<S>, S, H: Hasher<S> + Default> FromIterator<T> for HashSet<T,
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}
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#[stable]
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impl<T: Eq + Hash<S>, S, H: Hasher<S> + Default> Extend<T> for HashSet<T, H> {
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impl<T: Eq + Hash<S>, S, H: Hasher<S>> Extend<T> for HashSet<T, H> {
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fn extend<I: Iterator<Item=T>>(&mut self, mut iter: I) {
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for k in iter {
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self.insert(k);
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