mirror of
https://github.com/rust-lang/rust.git
synced 2024-10-30 14:01:51 +00:00
Add docs for get_remapped_def_id
This commit is contained in:
parent
457ff7c56c
commit
750a04ea7f
@ -220,6 +220,19 @@ impl ResolverAstLoweringExt for ResolverAstLowering {
|
||||
}
|
||||
|
||||
fn get_remapped_def_id(&self, mut local_def_id: LocalDefId) -> LocalDefId {
|
||||
// `generics_def_id_map` is a stack of mappings. As we go deeper in impl traits nesting we
|
||||
// push new mappings so we need to try first the latest mappings, hence `iter().rev()`.
|
||||
//
|
||||
// Consider:
|
||||
//
|
||||
// `fn test<'a, 'b>() -> impl Trait<&'a u8, Ty = impl Sized + 'b> {}`
|
||||
//
|
||||
// We would end with a generics_def_id_map like:
|
||||
//
|
||||
// `[[fn#'b -> impl_trait#'b], [fn#'b -> impl_sized#'b]]`
|
||||
//
|
||||
// for the opaque type generated on `impl Sized + 'b`, We want the result to be:
|
||||
// impl_sized#'b, so iterating forward is the wrong thing to do.
|
||||
for map in self.generics_def_id_map.iter().rev() {
|
||||
if let Some(r) = map.get(&local_def_id) {
|
||||
debug!("def_id_remapper: remapping from `{local_def_id:?}` to `{r:?}`");
|
||||
|
Loading…
Reference in New Issue
Block a user