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Make sure that def id <=> lang item map is bidirectional

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This commit is contained in:
Michael Goulet 2024-09-17 09:41:06 -04:00
parent 46b0f8bafc
commit d9624ed16c
1 changed files with 10 additions and 1 deletions
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11
compiler/rustc_hir/src/lang_items.rs
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@ -45,7 +45,16 @@ impl LanguageItems {
pub fn set(&mut self, item: LangItem, def_id: DefId) {
self.items[item as usize] = Some(def_id);
self.reverse_items.insert(def_id, item);
let preexisting = self.reverse_items.insert(def_id, item);
// This needs to be a bijection.
if let Some(preexisting) = preexisting {
panic!(
"For the bijection of LangItem <=> DefId to work,\
one item DefId may only be assigned one LangItem. \
Separate the LangItem definitions for {item:?} and {preexisting:?}."
);
}
}
pub fn from_def_id(&self, def_id: DefId) -> Option<LangItem> {