Function rustc_hir_analysis::collect::resolve_bound_vars::is_late_bound_map
source · fn is_late_bound_map(
tcx: TyCtxt<'_>,
owner_id: OwnerId,
) -> Option<&FxIndexSet<ItemLocalId>>
Expand description
Detects late-bound lifetimes and inserts them into
late_bound
.
A region declared on a fn is late-bound if:
- it is constrained by an argument type;
- it does not appear in a where-clause.
“Constrained” basically means that it appears in any type but
not amongst the inputs to a projection. In other words, <&'a T as Trait<''b>>::Foo
does not constrain 'a
or 'b
.