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Diffstat (limited to 'crates/hir-ty/src/lower.rs')
| -rw-r--r-- | crates/hir-ty/src/lower.rs | 35 |
1 files changed, 17 insertions, 18 deletions
diff --git a/crates/hir-ty/src/lower.rs b/crates/hir-ty/src/lower.rs index 446f1853c8..79b096068d 100644 --- a/crates/hir-ty/src/lower.rs +++ b/crates/hir-ty/src/lower.rs @@ -377,26 +377,25 @@ impl<'a> TyLoweringContext<'a> { // Count the number of `impl Trait` things that appear within our bounds. // Since t hose have been emitted as implicit type args already. counter.set(idx + count_impl_traits(type_ref) as u16); - let ( - _parent_params, - self_param, - type_params, - const_params, - _impl_trait_params, - lifetime_params, - ) = self + let kind = self .generics() .expect("variable impl trait lowering must be in a generic def") - .provenance_split(); - TyKind::BoundVar(BoundVar::new( - self.in_binders, - idx as usize - + self_param as usize - + type_params - + const_params - + lifetime_params, - )) - .intern(Interner) + .iter() + .enumerate() + .filter_map(|(i, (id, data))| match (id, data) { + ( + GenericParamId::TypeParamId(_), + GenericParamDataRef::TypeParamData(data), + ) if data.provenance == TypeParamProvenance::ArgumentImplTrait => { + Some(i) + } + _ => None, + }) + .nth(idx as usize) + .map_or(TyKind::Error, |id| { + TyKind::BoundVar(BoundVar { debruijn: self.in_binders, index: id }) + }); + kind.intern(Interner) } ImplTraitLoweringState::Disallowed => { // FIXME: report error |