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Deduplicate handling of early-bound params in RTN

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This commit is contained in:
Michael Goulet 2024-10-22 19:58:15 +00:00
parent 0b52ec3d7e
commit 1b7a91ed71
1 changed files with 29 additions and 22 deletions
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51
compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
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@ -291,6 +291,21 @@ fn late_arg_as_bound_arg<'tcx>(
}
}
/// Turn a [`ty::GenericParamDef`] into a bound arg. Generally, this should only
/// be used when turning early-bound vars into late-bound vars when lowering
/// return type notation.
fn generic_param_def_as_bound_arg(param: &ty::GenericParamDef) -> ty::BoundVariableKind {
match param.kind {
ty::GenericParamDefKind::Lifetime => {
ty::BoundVariableKind::Region(ty::BoundRegionKind::BrNamed(param.def_id, param.name))
}
ty::GenericParamDefKind::Type { .. } => {
ty::BoundVariableKind::Ty(ty::BoundTyKind::Param(param.def_id, param.name))
}
ty::GenericParamDefKind::Const { .. } => ty::BoundVariableKind::Const,
}
}
impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
/// Returns the binders in scope and the type of `Binder` that should be created for a poly trait ref.
fn poly_trait_ref_binder_info(&mut self) -> (Vec<ty::BoundVariableKind>, BinderScopeType) {
@ -1628,17 +1643,13 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
constraint.ident,
ty::AssocKind::Fn,
) {
bound_vars.extend(self.tcx.generics_of(assoc_fn.def_id).own_params.iter().map(
|param| match param.kind {
ty::GenericParamDefKind::Lifetime => ty::BoundVariableKind::Region(
ty::BoundRegionKind::BrNamed(param.def_id, param.name),
),
ty::GenericParamDefKind::Type { .. } => ty::BoundVariableKind::Ty(
ty::BoundTyKind::Param(param.def_id, param.name),
),
ty::GenericParamDefKind::Const { .. } => ty::BoundVariableKind::Const,
},
));
bound_vars.extend(
self.tcx
.generics_of(assoc_fn.def_id)
.own_params
.iter()
.map(|param| generic_param_def_as_bound_arg(param)),
);
bound_vars.extend(
self.tcx.fn_sig(assoc_fn.def_id).instantiate_identity().bound_vars(),
);
@ -1957,17 +1968,13 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
// Append the early-bound vars on the function, and then the late-bound ones.
// We actually turn type parameters into higher-ranked types here, but we
// deny them later in HIR lowering.
bound_vars.extend(self.tcx.generics_of(item_def_id).own_params.iter().map(|param| {
match param.kind {
ty::GenericParamDefKind::Lifetime => ty::BoundVariableKind::Region(
ty::BoundRegionKind::BrNamed(param.def_id, param.name),
),
ty::GenericParamDefKind::Type { .. } => {
ty::BoundVariableKind::Ty(ty::BoundTyKind::Param(param.def_id, param.name))
}
ty::GenericParamDefKind::Const { .. } => ty::BoundVariableKind::Const,
}
}));
bound_vars.extend(
self.tcx
.generics_of(item_def_id)
.own_params
.iter()
.map(|param| generic_param_def_as_bound_arg(param)),
);
bound_vars.extend(self.tcx.fn_sig(item_def_id).instantiate_identity().bound_vars());
// SUBTLE: Stash the old bound vars onto the *item segment* before appending