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Rollup merge of #121281 - kadiwa4:test_103626, r=estebank,lcnr
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regression test for #103626

I don't know what a descriptive filename for this would be.

Fixes #103626
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matthiaskrgr authored Mar 24, 2024
2 parents 2f090c3 + 188c46a commit 5167581
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trait FromResidual<R = <Self as Try>::Residual> {
fn from_residual(residual: R) -> Self;
}

trait Try {
type Residual;
}

fn w<'a, T: 'a, F: Fn(&'a T)>() {
let b: &dyn FromResidual = &();
//~^ ERROR: the trait `FromResidual` cannot be made into an object
//~| ERROR: the trait `FromResidual` cannot be made into an object
}

fn main() {}
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error[E0038]: the trait `FromResidual` cannot be made into an object
--> $DIR/canonicalize-fresh-infer-vars-issue-103626.rs:10:17
|
LL | let b: &dyn FromResidual = &();
| ^^^^^^^^^^^^
|
= note: it cannot use `Self` as a type parameter in a supertrait or `where`-clause

error[E0038]: the trait `FromResidual` cannot be made into an object
--> $DIR/canonicalize-fresh-infer-vars-issue-103626.rs:10:12
|
LL | let b: &dyn FromResidual = &();
| ^^^^^^^^^^^^^^^^^ `FromResidual` cannot be made into an object
|
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/canonicalize-fresh-infer-vars-issue-103626.rs:2:8
|
LL | trait FromResidual<R = <Self as Try>::Residual> {
| ------------ this trait cannot be made into an object...
LL | fn from_residual(residual: R) -> Self;
| ^^^^^^^^^^^^^ ...because associated function `from_residual` has no `self` parameter
help: consider turning `from_residual` into a method by giving it a `&self` argument
|
LL | fn from_residual(&self, residual: R) -> Self;
| ++++++
help: alternatively, consider constraining `from_residual` so it does not apply to trait objects
|
LL | fn from_residual(residual: R) -> Self where Self: Sized;
| +++++++++++++++++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0038`.

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