bjoernager/rust
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Improve parse_dot_or_call_expr_with.

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Avoid all the extra work in the very common case where `attrs` is empty.
This commit is contained in:
Nicholas Nethercote 2022-08-23 13:28:20 +10:00
parent b38106b6d8
commit c768617f6f
1 changed files with 11 additions and 6 deletions
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17
compiler/rustc_parse/src/parser/expr.rs
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@ -944,13 +944,18 @@ impl<'a> Parser<'a> {
// Stitch the list of outer attributes onto the return value.
// A little bit ugly, but the best way given the current code
// structure
self.parse_dot_or_call_expr_with_(e0, lo).map(|expr| {
expr.map(|mut expr| {
attrs.extend(expr.attrs);
expr.attrs = attrs;
expr
let res = self.parse_dot_or_call_expr_with_(e0, lo);
if attrs.is_empty() {
res
} else {
res.map(|expr| {
expr.map(|mut expr| {
attrs.extend(expr.attrs);
expr.attrs = attrs;
expr
})
})
})
}
}
fn parse_dot_or_call_expr_with_(&mut self, mut e: P<Expr>, lo: Span) -> PResult<'a, P<Expr>> {