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allocate string only when error will be emitted

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Signed-off-by: Miguel Guarniz <mi9uel9@gmail.com>
This commit is contained in:
Miguel Guarniz 2022-05-14 12:23:23 -04:00
parent f77658b470
commit 48fd66613b
1 changed files with 7 additions and 2 deletions
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9
compiler/rustc_passes/src/check_const.rs
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@ -98,7 +98,7 @@ fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) {
.unwrap_or(false);
if !is_implemented {
to_implement.push(tcx.item_name(trait_item_id).to_string());
to_implement.push(trait_item_id);
}
}
}
@ -106,13 +106,18 @@ fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) {
// all nonconst trait functions (not marked with #[default_method_body_is_const])
// must be implemented
if !to_implement.is_empty() {
let not_implemented = to_implement
.into_iter()
.map(|did| tcx.item_name(did).to_string())
.collect::<Vec<_>>()
.join("`, `");
tcx
.sess
.struct_span_err(
item.span,
"const trait implementations may not use non-const default functions",
)
.note(&format!("`{}` not implemented", to_implement.join("`, `")))
.note(&format!("`{}` not implemented", not_implemented))
.emit();
}
}