mirror of https://github.com/rust-lang/rust
50 lines
2.0 KiB
Plaintext
50 lines
2.0 KiB
Plaintext
error[E0038]: the trait `Foo` cannot be made into an object
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--> $DIR/span-bug-issue-121597.rs:14:23
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LL | let x: &dyn Foo = &();
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| ^^^ `Foo` cannot be made into an object
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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>
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--> $DIR/span-bug-issue-121597.rs:4:12
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LL | trait Foo: for<T> Bar<T> {}
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| --- ^^^^^^^^^^^^^ ...because where clause cannot reference non-lifetime `for<...>` variables
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| this trait cannot be made into an object...
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= note: required for the cast from `&()` to `&dyn Foo`
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error[E0038]: the trait `Foo` cannot be made into an object
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--> $DIR/span-bug-issue-121597.rs:14:12
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LL | let x: &dyn Foo = &();
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| ^^^^^^^^ `Foo` cannot be made into an object
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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>
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--> $DIR/span-bug-issue-121597.rs:4:12
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LL | trait Foo: for<T> Bar<T> {}
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| --- ^^^^^^^^^^^^^ ...because where clause cannot reference non-lifetime `for<...>` variables
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| this trait cannot be made into an object...
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error[E0308]: mismatched types
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--> $DIR/span-bug-issue-121597.rs:18:15
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LL | needs_bar(x);
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| --------- ^ types differ in mutability
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| arguments to this function are incorrect
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= note: expected raw pointer `*mut Type2`
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found reference `&dyn Foo`
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note: function defined here
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--> $DIR/span-bug-issue-121597.rs:11:4
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LL | fn needs_bar(_: *mut Type2) {}
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| ^^^^^^^^^ -------------
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error: aborting due to 3 previous errors
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Some errors have detailed explanations: E0038, E0308.
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For more information about an error, try `rustc --explain E0038`.
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