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WIP: Incorporate variance into typeck #12828

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WIP: Incorporate variance into typeck #12828

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15 changes: 14 additions & 1 deletion src/librustc/middle/typeck/variance.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -674,8 +674,19 @@ impl<'a> ConstraintContext<'a> {
substs, variance);
}

ty::ty_trait(~ty::TyTrait { def_id, ref substs, .. }) => {
ty::ty_trait(~ty::TyTrait { def_id, ref substs, store, mutability, .. }) => {
match store {
ty::RegionTraitStore(region) => {
let contra = self.contravariant(variance);
self.add_constraints_from_region(region, contra);
}
ty::UniqTraitStore => {},
}
let trait_def = ty::lookup_trait_def(self.tcx(), def_id);
let variance = match mutability {
ast::MutMutable => self.invariant(variance),
ast::MutImmutable => variance,
};
self.add_constraints_from_substs(def_id, &trait_def.generics,
substs, variance);
}
Expand Down Expand Up @@ -781,6 +792,8 @@ impl<'a> ConstraintContext<'a> {
fn add_constraints_from_region(&mut self,
region: ty::Region,
variance: VarianceTermPtr<'a>) {
debug!("add_constraints_from_region(region={}, variance={})",
region.repr(self.tcx()), variance.to_str());
match region {
ty::ReEarlyBound(param_id, _, _) => {
let index = self.inferred_index(param_id);
Expand Down