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Replace some uses of vec.drain(..) with vec.into_iter()

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IntoIter should optimize better than Drain
This commit is contained in:
The8472 2021-11-06 18:42:07 +01:00
parent d22dd65835
commit ff87ff962c
2 changed files with 6 additions and 6 deletions
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2
compiler/rustc_middle/src/mir/mod.rs
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@ -2665,7 +2665,7 @@ impl<'tcx> UserTypeProjections {
mut self,
mut f: impl FnMut(UserTypeProjection) -> UserTypeProjection,
) -> Self {
self.contents = self.contents.drain(..).map(|(proj, span)| (f(proj), span)).collect();
self.contents = self.contents.into_iter().map(|(proj, span)| (f(proj), span)).collect();
self
}

10
compiler/rustc_resolve/src/late/diagnostics.rs
View file

@ -333,7 +333,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
let candidates = self
.r
.lookup_import_candidates(ident, ns, &self.parent_scope, is_expected)
.drain(..)
.into_iter()
.filter(|ImportSuggestion { did, .. }| {
match (did, res.and_then(|res| res.opt_def_id())) {
(Some(suggestion_did), Some(actual_did)) => *suggestion_did != actual_did,
@ -1554,7 +1554,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
if suggest_only_tuple_variants {
// Suggest only tuple variants regardless of whether they have fields and do not
// suggest path with added parentheses.
let mut suggestable_variants = variants
let suggestable_variants = variants
.iter()
.filter(|(.., kind)| *kind == CtorKind::Fn)
.map(|(variant, ..)| path_names_to_string(variant))
@ -1580,7 +1580,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
err.span_suggestions(
span,
&msg,
suggestable_variants.drain(..),
suggestable_variants.into_iter(),
Applicability::MaybeIncorrect,
);
}
@ -1638,7 +1638,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
);
}
let mut suggestable_variants_with_placeholders = variants
let suggestable_variants_with_placeholders = variants
.iter()
.filter(|(_, def_id, kind)| needs_placeholder(*def_id, *kind))
.map(|(variant, _, kind)| (path_names_to_string(variant), kind))
@ -1663,7 +1663,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
err.span_suggestions(
span,
msg,
suggestable_variants_with_placeholders.drain(..),
suggestable_variants_with_placeholders.into_iter(),
Applicability::HasPlaceholders,
);
}