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	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
  |
6 |     <i32 as Foo>::foo();
  |      ^^^ the trait `Bar` is not implemented for `i32`, which is required by `i32: Foo`
  |
help: this trait has no implementations, consider adding one
 --> f100.rs:2:1
  |
2 | trait Bar {}
  | ^^^^^^^^^
note: required for `i32` to implement `Foo`
 --> f100.rs:3:14
  |
3 | impl<T: Bar> Foo for T {}
  |         ---  ^^^     ^
  |         |
  |         unsatisfied trait bound introduced here
```
Fix #40120.
		
	
			
		
			
				
	
	
		
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			92 lines
		
	
	
		
			4.1 KiB
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
error[E0277]: the type `[isize]` cannot be indexed by `u8`
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  --> $DIR/integral-indexing.rs:6:7
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LL |     v[3u8];
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   |       ^^^ slice indices are of type `usize` or ranges of `usize`
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   = help: the trait `SliceIndex<[isize]>` is not implemented for `u8`, which is required by `Vec<isize>: Index<_>`
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   = help: the trait `SliceIndex<[isize]>` is implemented for `usize`
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   = help: for that trait implementation, expected `usize`, found `u8`
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   = note: required for `Vec<isize>` to implement `Index<u8>`
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error[E0277]: the type `[isize]` cannot be indexed by `i8`
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  --> $DIR/integral-indexing.rs:7:7
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LL |     v[3i8];
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   |       ^^^ slice indices are of type `usize` or ranges of `usize`
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   = help: the trait `SliceIndex<[isize]>` is not implemented for `i8`, which is required by `Vec<isize>: Index<_>`
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   = help: the trait `SliceIndex<[isize]>` is implemented for `usize`
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   = help: for that trait implementation, expected `usize`, found `i8`
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   = note: required for `Vec<isize>` to implement `Index<i8>`
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error[E0277]: the type `[isize]` cannot be indexed by `u32`
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  --> $DIR/integral-indexing.rs:8:7
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LL |     v[3u32];
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   |       ^^^^ slice indices are of type `usize` or ranges of `usize`
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   |
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   = help: the trait `SliceIndex<[isize]>` is not implemented for `u32`, which is required by `Vec<isize>: Index<_>`
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   = help: the trait `SliceIndex<[isize]>` is implemented for `usize`
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   = help: for that trait implementation, expected `usize`, found `u32`
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   = note: required for `Vec<isize>` to implement `Index<u32>`
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error[E0277]: the type `[isize]` cannot be indexed by `i32`
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  --> $DIR/integral-indexing.rs:9:7
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LL |     v[3i32];
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   |       ^^^^ slice indices are of type `usize` or ranges of `usize`
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   |
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   = help: the trait `SliceIndex<[isize]>` is not implemented for `i32`, which is required by `Vec<isize>: Index<_>`
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   = help: the trait `SliceIndex<[isize]>` is implemented for `usize`
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   = help: for that trait implementation, expected `usize`, found `i32`
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   = note: required for `Vec<isize>` to implement `Index<i32>`
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error[E0277]: the type `[u8]` cannot be indexed by `u8`
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  --> $DIR/integral-indexing.rs:12:18
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LL |     s.as_bytes()[3u8];
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   |                  ^^^ slice indices are of type `usize` or ranges of `usize`
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   = help: the trait `SliceIndex<[u8]>` is not implemented for `u8`, which is required by `[u8]: Index<_>`
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   = help: the trait `SliceIndex<[u8]>` is implemented for `usize`
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   = help: for that trait implementation, expected `usize`, found `u8`
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   = note: required for `[u8]` to implement `Index<u8>`
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error[E0277]: the type `[u8]` cannot be indexed by `i8`
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  --> $DIR/integral-indexing.rs:13:18
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LL |     s.as_bytes()[3i8];
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   |                  ^^^ slice indices are of type `usize` or ranges of `usize`
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   = help: the trait `SliceIndex<[u8]>` is not implemented for `i8`, which is required by `[u8]: Index<_>`
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   = help: the trait `SliceIndex<[u8]>` is implemented for `usize`
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   = help: for that trait implementation, expected `usize`, found `i8`
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   = note: required for `[u8]` to implement `Index<i8>`
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error[E0277]: the type `[u8]` cannot be indexed by `u32`
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  --> $DIR/integral-indexing.rs:14:18
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LL |     s.as_bytes()[3u32];
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   |                  ^^^^ slice indices are of type `usize` or ranges of `usize`
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   |
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   = help: the trait `SliceIndex<[u8]>` is not implemented for `u32`, which is required by `[u8]: Index<_>`
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   = help: the trait `SliceIndex<[u8]>` is implemented for `usize`
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   = help: for that trait implementation, expected `usize`, found `u32`
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   = note: required for `[u8]` to implement `Index<u32>`
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error[E0277]: the type `[u8]` cannot be indexed by `i32`
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  --> $DIR/integral-indexing.rs:15:18
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LL |     s.as_bytes()[3i32];
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   |                  ^^^^ slice indices are of type `usize` or ranges of `usize`
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   |
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   = help: the trait `SliceIndex<[u8]>` is not implemented for `i32`, which is required by `[u8]: Index<_>`
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   = help: the trait `SliceIndex<[u8]>` is implemented for `usize`
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   = help: for that trait implementation, expected `usize`, found `i32`
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   = note: required for `[u8]` to implement `Index<i32>`
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error: aborting due to 8 previous errors
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For more information about this error, try `rustc --explain E0277`.
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