Commits on Jan 30, 2024

1. Provide more context on derived obligation error primary label …

   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 rust-lang#40120.

   

   estebank committed Jan 30, 2024
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