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https://github.com/rust-lang/rust
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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.
100 lines
4.8 KiB
Plaintext
100 lines
4.8 KiB
Plaintext
error[E0277]: the size for values of type `dyn A` cannot be known at compilation time
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--> $DIR/closure-return-type-must-be-sized.rs:54:5
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LL | a::foo::<fn() -> dyn A>();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `fn() -> dyn A`, the trait `Sized` is not implemented for `dyn A`, which is required by `fn() -> dyn A: FnOnce()`
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= note: required because it appears within the type `fn() -> dyn A`
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error[E0277]: the size for values of type `dyn A` cannot be known at compilation time
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--> $DIR/closure-return-type-must-be-sized.rs:55:14
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LL | a::bar::<fn() -> dyn A, _>();
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| ^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `fn() -> dyn A`, the trait `Sized` is not implemented for `dyn A`, which is required by `fn() -> dyn A: FnOnce()`
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= note: required because it appears within the type `fn() -> dyn A`
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note: required by a bound in `a::bar`
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--> $DIR/closure-return-type-must-be-sized.rs:14:19
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LL | pub fn bar<F: FnOnce() -> R, R: ?Sized>() {}
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| ^^^^^^^^^^^^^ required by this bound in `bar`
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error[E0277]: the size for values of type `dyn A` cannot be known at compilation time
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--> $DIR/closure-return-type-must-be-sized.rs:56:5
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LL | a::baz::<fn() -> dyn A>();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `fn() -> dyn A`, the trait `Sized` is not implemented for `dyn A`, which is required by `fn() -> dyn A: FnOnce()`
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= note: required because it appears within the type `fn() -> dyn A`
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error[E0277]: the size for values of type `dyn A` cannot be known at compilation time
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--> $DIR/closure-return-type-must-be-sized.rs:61:5
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LL | b::foo::<fn() -> dyn A>();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `fn() -> dyn A`, the trait `Sized` is not implemented for `dyn A`, which is required by `fn() -> dyn A: FnOnce()`
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= note: required because it appears within the type `fn() -> dyn A`
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error[E0277]: the size for values of type `dyn A` cannot be known at compilation time
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--> $DIR/closure-return-type-must-be-sized.rs:62:14
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LL | b::bar::<fn() -> dyn A, _>();
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| ^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `fn() -> dyn A`, the trait `Sized` is not implemented for `dyn A`, which is required by `fn() -> dyn A: Fn()`
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= note: required because it appears within the type `fn() -> dyn A`
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note: required by a bound in `b::bar`
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--> $DIR/closure-return-type-must-be-sized.rs:28:19
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LL | pub fn bar<F: Fn() -> R, R: ?Sized>() {}
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| ^^^^^^^^^ required by this bound in `bar`
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error[E0277]: the size for values of type `dyn A` cannot be known at compilation time
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--> $DIR/closure-return-type-must-be-sized.rs:63:5
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LL | b::baz::<fn() -> dyn A>();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `fn() -> dyn A`, the trait `Sized` is not implemented for `dyn A`, which is required by `fn() -> dyn A: FnOnce()`
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= note: required because it appears within the type `fn() -> dyn A`
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error[E0277]: the size for values of type `dyn A` cannot be known at compilation time
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--> $DIR/closure-return-type-must-be-sized.rs:68:5
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LL | c::foo::<fn() -> dyn A>();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `fn() -> dyn A`, the trait `Sized` is not implemented for `dyn A`, which is required by `fn() -> dyn A: FnOnce()`
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= note: required because it appears within the type `fn() -> dyn A`
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error[E0277]: the size for values of type `dyn A` cannot be known at compilation time
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--> $DIR/closure-return-type-must-be-sized.rs:69:14
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LL | c::bar::<fn() -> dyn A, _>();
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| ^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `fn() -> dyn A`, the trait `Sized` is not implemented for `dyn A`, which is required by `fn() -> dyn A: FnMut()`
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= note: required because it appears within the type `fn() -> dyn A`
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note: required by a bound in `c::bar`
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--> $DIR/closure-return-type-must-be-sized.rs:42:19
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LL | pub fn bar<F: FnMut() -> R, R: ?Sized>() {}
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| ^^^^^^^^^^^^ required by this bound in `bar`
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error[E0277]: the size for values of type `dyn A` cannot be known at compilation time
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--> $DIR/closure-return-type-must-be-sized.rs:70:5
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LL | c::baz::<fn() -> dyn A>();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `fn() -> dyn A`, the trait `Sized` is not implemented for `dyn A`, which is required by `fn() -> dyn A: FnOnce()`
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= note: required because it appears within the type `fn() -> dyn A`
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error: aborting due to 9 previous errors
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For more information about this error, try `rustc --explain E0277`.
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