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Rollup merge of #52306 - ljedrz:obligation_forest_clone, r=varkor

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Reduce the number of clone()s needed in obligation_forest

Some can be avoided by using `remove_entry` instead of `remove`.
This commit is contained in:
kennytm 2018-07-17 02:18:15 +08:00
commit 2d1880893f
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1 changed files with 8 additions and 3 deletions
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11
src/librustc_data_structures/obligation_forest/mod.rs
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@ -496,9 +496,14 @@ impl<O: ForestObligation> ObligationForest<O> {
}
}
NodeState::Done => {
self.waiting_cache.remove(self.nodes[i].obligation.as_predicate());
// FIXME(HashMap): why can't I get my key back?
self.done_cache.insert(self.nodes[i].obligation.as_predicate().clone());
// Avoid cloning the key (predicate) in case it exists in the waiting cache
if let Some((predicate, _)) = self.waiting_cache
.remove_entry(self.nodes[i].obligation.as_predicate())
{
self.done_cache.insert(predicate);
} else {
self.done_cache.insert(self.nodes[i].obligation.as_predicate().clone());
}
node_rewrites[i] = nodes_len;
dead_nodes += 1;
}