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rustc_parse: avoid creating unnecessary intermediate strings

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Xiretza 2022-12-27 20:46:39 +01:00
parent f2acbb9d1e
commit 0e36e7cebe
1 changed files with 2 additions and 1 deletions
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3
compiler/rustc_parse/src/parser/item.rs
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@ -22,6 +22,7 @@ use rustc_span::lev_distance::lev_distance;
use rustc_span::source_map::{self, Span};
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::DUMMY_SP;
use std::fmt::Write;
use std::mem;
use thin_vec::ThinVec;
@ -1109,7 +1110,7 @@ impl<'a> Parser<'a> {
let fixed_name_sp = ident.span.to(idents.last().unwrap().span);
let mut fixed_name = ident.name.to_string();
for part in idents {
fixed_name.push_str(&format!("_{}", part.name));
write!(fixed_name, "_{}", part.name).unwrap();
}
ident = Ident::from_str_and_span(&fixed_name, fixed_name_sp);