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Add test for RPIT defined with different hidden types with different substs #111947

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May 26, 2023
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12 changes: 12 additions & 0 deletions tests/ui/impl-trait/multiple-defining-usages-in-body.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
trait Trait {}
impl Trait for () {}

fn foo<T: Trait, U: Trait>() -> impl Trait {
//~^ WARN function cannot return without recursing [unconditional_recursion]
let a: T = foo::<T, U>();
//~^ ERROR concrete type differs from previous defining opaque type use
loop {}
let _: T = foo::<U, T>();
}

fn main() {}
26 changes: 26 additions & 0 deletions tests/ui/impl-trait/multiple-defining-usages-in-body.stderr
Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
warning: function cannot return without recursing
--> $DIR/multiple-defining-usages-in-body.rs:4:1
|
LL | fn foo<T: Trait, U: Trait>() -> impl Trait {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
LL |
LL | let a: T = foo::<T, U>();
| ------------- recursive call site
|
= help: a `loop` may express intention better if this is on purpose
= note: `#[warn(unconditional_recursion)]` on by default

error: concrete type differs from previous defining opaque type use
--> $DIR/multiple-defining-usages-in-body.rs:6:16
|
LL | let a: T = foo::<T, U>();
| ^^^^^^^^^^^^^ expected `U`, got `T`
|
note: previous use here
--> $DIR/multiple-defining-usages-in-body.rs:9:16
|
LL | let _: T = foo::<U, T>();
| ^^^^^^^^^^^^^

error: aborting due to previous error; 1 warning emitted