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More TyBuilder use

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This commit is contained in:
Florian Diebold 2021-04-03 21:59:13 +02:00
parent 66fec39aa0
commit 77333a571f
1 changed files with 9 additions and 12 deletions
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21
crates/hir_ty/src/infer/coerce.rs
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@ -8,7 +8,7 @@ use chalk_ir::{cast::Cast, Mutability, TyVariableKind};
use hir_def::lang_item::LangItemTarget;
use crate::{
autoderef, to_chalk_trait_id, traits::Solution, Interner, Substitution, TraitRef, Ty,
autoderef, traits::Solution, Interner, Ty,
TyBuilder, TyKind,
};
@ -131,18 +131,15 @@ impl<'a> InferenceContext<'a> {
_ => return None,
};
let generic_params = crate::utils::generics(self.db.upcast(), coerce_unsized_trait.into());
if generic_params.len() != 2 {
// The CoerceUnsized trait should have two generic params: Self and T.
return None;
}
let trait_ref = {
let b = TyBuilder::trait_ref(self.db, coerce_unsized_trait);
if b.remaining() != 2 {
// The CoerceUnsized trait should have two generic params: Self and T.
return None;
}
b.push(from_ty.clone()).push(to_ty.clone()).build()
};
let substs = Substitution::build_for_generics(&generic_params)
.push(from_ty.clone())
.push(to_ty.clone())
.build();
let trait_ref =
TraitRef { trait_id: to_chalk_trait_id(coerce_unsized_trait), substitution: substs };
let goal = InEnvironment::new(self.trait_env.env.clone(), trait_ref.cast(&Interner));
let canonicalizer = self.canonicalizer();