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Fix #4966

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We add a level of binders when converting our function pointer to Chalk's; we
need to remove it again on the way back.
This commit is contained in:
Florian Diebold 2020-07-10 19:14:33 +02:00 committed by Florian Diebold
parent 70d1b848eb
commit 8a72e40ca9
2 changed files with 63 additions and 2 deletions
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57
crates/ra_hir_ty/src/tests/regression.rs
View file

@ -779,3 +779,60 @@ pub trait Service<Request> {
"###
);
}
#[test]
fn issue_4966() {
assert_snapshot!(
infer(r#"
pub trait IntoIterator {
type Item;
}
struct Repeat<A> { element: A }
struct Map<F> { f: F }
struct Vec<T> {}
#[lang = "deref"]
pub trait Deref {
type Target;
}
impl<T> Deref for Vec<T> {
type Target = [T];
}
fn from_iter<A, T: IntoIterator<Item = A>>(iter: T) -> Vec<A> {}
fn main() {
let inner = Map { f: |_: &f64| 0.0 };
let repeat = Repeat { element: inner };
let vec = from_iter(repeat);
vec.foo_bar();
}
"#),
@r###"
270..274 'iter': T
289..291 '{}': ()
303..447 '{ ...r(); }': ()
313..318 'inner': Map<|&f64| -> f64>
321..345 'Map { ... 0.0 }': Map<|&f64| -> f64>
330..343 '|_: &f64| 0.0': |&f64| -> f64
331..332 '_': &f64
340..343 '0.0': f64
356..362 'repeat': Repeat<Map<|&f64| -> f64>>
365..390 'Repeat...nner }': Repeat<Map<|&f64| -> f64>>
383..388 'inner': Map<|&f64| -> f64>
401..404 'vec': Vec<IntoIterator::Item<Repeat<Map<|&f64| -> f64>>>>
407..416 'from_iter': fn from_iter<IntoIterator::Item<Repeat<Map<|&f64| -> f64>>>, Repeat<Map<|&f64| -> f64>>>(Repeat<Map<|&f64| -> f64>>) -> Vec<IntoIterator::Item<Repeat<Map<|&f64| -> f64>>>>
407..424 'from_i...epeat)': Vec<IntoIterator::Item<Repeat<Map<|&f64| -> f64>>>>
417..423 'repeat': Repeat<Map<|&f64| -> f64>>
431..434 'vec': Vec<IntoIterator::Item<Repeat<Map<|&f64| -> f64>>>>
431..444 'vec.foo_bar()': {unknown}
"###
);
}

8
crates/ra_hir_ty/src/traits/chalk/mapping.rs
View file

@ -115,8 +115,12 @@ impl ToChalk for Ty {
let parameters = from_chalk(db, opaque_ty.substitution);
Ty::Opaque(OpaqueTy { opaque_ty_id: impl_trait_id, parameters })
}
chalk_ir::TyData::Function(chalk_ir::Fn { num_binders: _, substitution }) => {
let parameters: Substs = from_chalk(db, substitution);
chalk_ir::TyData::Function(chalk_ir::Fn { num_binders, substitution }) => {
assert_eq!(num_binders, 0);
let parameters: Substs = from_chalk(
db,
substitution.shifted_out(&Interner).expect("fn ptr should have no binders"),
);
Ty::Apply(ApplicationTy {
ctor: TypeCtor::FnPtr { num_args: (parameters.len() - 1) as u16 },
parameters,