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Add test for 113326 #116801

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Oct 25, 2023
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Add test for 113326 #116801

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17 changes: 17 additions & 0 deletions tests/ui/type-alias-impl-trait/recursive-fn-tait.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
// test for #113326
#![feature(type_alias_impl_trait)]

pub type Diff = impl Fn(usize) -> usize;

pub fn lift() -> Diff {
|_: usize |loop {}
}

pub fn add(
n: Diff,
m: Diff,
) -> Diff {
move |x: usize| m(n(x)) //~ ERROR: concrete type differs
}

fn main() {}
14 changes: 14 additions & 0 deletions tests/ui/type-alias-impl-trait/recursive-fn-tait.stderr
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Original file line number Diff line number Diff line change
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error: concrete type differs from previous defining opaque type use
--> $DIR/recursive-fn-tait.rs:14:5
|
LL | move |x: usize| m(n(x))
| ^^^^^^^^^^^^^^^^^^^^^^^ expected `{closure@$DIR/recursive-fn-tait.rs:7:5: 7:16}`, got `{closure@$DIR/recursive-fn-tait.rs:14:5: 14:20}`
|
note: previous use here
--> $DIR/recursive-fn-tait.rs:7:5
|
LL | |_: usize |loop {}
| ^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

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