diff options
| -rw-r--r-- | tests/ui/traits/object/canonicalize-fresh-infer-vars-issue-103626.rs | 15 | ||||
| -rw-r--r-- | tests/ui/traits/object/canonicalize-fresh-infer-vars-issue-103626.stderr | 33 |
2 files changed, 48 insertions, 0 deletions
diff --git a/tests/ui/traits/object/canonicalize-fresh-infer-vars-issue-103626.rs b/tests/ui/traits/object/canonicalize-fresh-infer-vars-issue-103626.rs new file mode 100644 index 00000000000..3af299e5b11 --- /dev/null +++ b/tests/ui/traits/object/canonicalize-fresh-infer-vars-issue-103626.rs @@ -0,0 +1,15 @@ +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() {} diff --git a/tests/ui/traits/object/canonicalize-fresh-infer-vars-issue-103626.stderr b/tests/ui/traits/object/canonicalize-fresh-infer-vars-issue-103626.stderr new file mode 100644 index 00000000000..d5e9b1be63b --- /dev/null +++ b/tests/ui/traits/object/canonicalize-fresh-infer-vars-issue-103626.stderr @@ -0,0 +1,33 @@ +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`. |