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More TyBuilder use

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This commit is contained in:
Florian Diebold 2021-04-03 21:56:18 +02:00
parent cd227f581e
commit 66fec39aa0
1 changed files with 15 additions and 23 deletions
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38
crates/hir_ty/src/autoderef.rs
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@ -13,11 +13,9 @@ use log::{info, warn};
use crate::{
db::HirDatabase,
to_assoc_type_id, to_chalk_trait_id,
traits::{InEnvironment, Solution},
utils::generics,
AliasEq, AliasTy, BoundVar, Canonical, CanonicalVarKinds, DebruijnIndex, Interner,
ProjectionTy, Substitution, TraitRef, Ty, TyKind,
AliasEq, AliasTy, BoundVar, Canonical, CanonicalVarKinds, DebruijnIndex, Interner, Ty,
TyBuilder, TyKind,
};
const AUTODEREF_RECURSION_LIMIT: usize = 10;
@ -57,21 +55,20 @@ fn deref_by_trait(
};
let target = db.trait_data(deref_trait).associated_type_by_name(&name![Target])?;
let generic_params = generics(db.upcast(), target.into());
if generic_params.len() != 1 {
// the Target type + Deref trait should only have one generic parameter,
// namely Deref's Self type
return None;
}
let projection = {
let b = TyBuilder::assoc_type_projection(db, target);
if b.remaining() != 1 {
// the Target type + Deref trait should only have one generic parameter,
// namely Deref's Self type
return None;
}
b.push(ty.goal.value.clone()).build()
};
// FIXME make the Canonical / bound var handling nicer
let parameters =
Substitution::build_for_generics(&generic_params).push(ty.goal.value.clone()).build();
// Check that the type implements Deref at all
let trait_ref =
TraitRef { trait_id: to_chalk_trait_id(deref_trait), substitution: parameters.clone() };
let trait_ref = projection.trait_ref(db);
let implements_goal = Canonical {
binders: ty.goal.binders.clone(),
value: InEnvironment {
@ -84,11 +81,8 @@ fn deref_by_trait(
}
// Now do the assoc type projection
let projection = AliasEq {
alias: AliasTy::Projection(ProjectionTy {
associated_ty_id: to_assoc_type_id(target),
substitution: parameters,
}),
let alias_eq = AliasEq {
alias: AliasTy::Projection(projection),
ty: TyKind::BoundVar(BoundVar::new(
DebruijnIndex::INNERMOST,
ty.goal.binders.len(&Interner),
@ -96,9 +90,7 @@ fn deref_by_trait(
.intern(&Interner),
};
let obligation = projection.cast(&Interner);
let in_env = InEnvironment { goal: obligation, environment: ty.environment };
let in_env = InEnvironment { goal: alias_eq.cast(&Interner), environment: ty.environment };
let canonical = Canonical {
value: in_env,