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Rollup of 3 pull requests #130500

Merged
merged 7 commits into from
Sep 18, 2024
11 changes: 10 additions & 1 deletion compiler/rustc_hir/src/lang_items.rs
Original file line number Diff line number Diff line change
Expand Up @@ -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> {
Expand Down