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6efddac288
Expand the primary span of E0277 when the immediate unmet bound is not what the user wrote:
```
error[E0277]: the trait bound `i32: Bar` is not satisfied
--> f100.rs:6:6
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6 | <i32 as Foo>::foo();
| ^^^ the trait `Bar` is not implemented for `i32`, which is required by `i32: Foo`
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help: this trait has no implementations, consider adding one
--> f100.rs:2:1
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2 | trait Bar {}
| ^^^^^^^^^
note: required for `i32` to implement `Foo`
--> f100.rs:3:14
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3 | impl<T: Bar> Foo for T {}
| --- ^^^ ^
| |
| unsatisfied trait bound introduced here
```
Fix #40120.
32 lines
1.6 KiB
Plaintext
32 lines
1.6 KiB
Plaintext
error[E0277]: the size for values of type `str` cannot be known at compilation time
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--> $DIR/unsized-ret.rs:10:11
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LL | foo::<fn() -> str, _>(None, ());
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| ^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `fn() -> str`, the trait `Sized` is not implemented for `str`, which is required by `fn() -> str: Fn<_>`
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= note: required because it appears within the type `fn() -> str`
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note: required by a bound in `foo`
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--> $DIR/unsized-ret.rs:5:11
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LL | fn foo<F: Fn<T>, T:std::marker::Tuple>(f: Option<F>, t: T) {
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| ^^^^^ required by this bound in `foo`
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error[E0277]: the size for values of type `(dyn std::fmt::Display + 'a)` cannot be known at compilation time
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--> $DIR/unsized-ret.rs:13:11
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LL | foo::<for<'a> fn(&'a ()) -> (dyn std::fmt::Display + 'a), _>(None, (&(),));
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `for<'a> fn(&'a ()) -> (dyn std::fmt::Display + 'a)`, the trait `for<'a> Sized` is not implemented for `(dyn std::fmt::Display + 'a)`, which is required by `for<'a> fn(&'a ()) -> (dyn std::fmt::Display + 'a): Fn<_>`
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= note: required because it appears within the type `for<'a> fn(&'a ()) -> (dyn std::fmt::Display + 'a)`
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note: required by a bound in `foo`
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--> $DIR/unsized-ret.rs:5:11
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LL | fn foo<F: Fn<T>, T:std::marker::Tuple>(f: Option<F>, t: T) {
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| ^^^^^ required by this bound in `foo`
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0277`.
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