bjoernager/rust
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Reserve space in advance

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This commit is contained in:
Dániel Buga 2020-10-16 11:43:39 +02:00
parent 2ca0b85593
commit a7f2bb6343
4 changed files with 9 additions and 7 deletions
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10
compiler/rustc_ast_lowering/src/lib.rs
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@ -2011,17 +2011,17 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
//
// For the "output" lifetime parameters, we just want to
// generate `'_`.
let mut generic_args: Vec<_> = lifetime_params[..input_lifetimes_count]
.iter()
.map(|&(span, hir_name)| {
let mut generic_args = Vec::with_capacity(lifetime_params.len());
generic_args.extend(lifetime_params[..input_lifetimes_count].iter().map(
|&(span, hir_name)| {
// Input lifetime like `'a` or `'1`:
GenericArg::Lifetime(hir::Lifetime {
hir_id: self.next_id(),
span,
name: hir::LifetimeName::Param(hir_name),
})
})
.collect();
},
));
generic_args.extend(lifetime_params[input_lifetimes_count..].iter().map(|&(span, _)|
// Output lifetime like `'_`.
GenericArg::Lifetime(hir::Lifetime {