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to fix incorrect suggestion for trait bounds involving binary operators.
Fixes #93927, #92347, #93744.
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* On suggestions that include deletions, use a diff inspired output format
* When suggesting addition, use `+` as underline
* Color highlight modified span
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For example, if you had this code:
fn foo(x: i32, y: f32) -> f32 {
x * y
}
You would get this error:
error[E0277]: cannot multiply `f32` to `i32`
--> src/lib.rs:2:7
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2 | x * y
| ^ no implementation for `i32 * f32`
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= help: the trait `Mul<f32>` is not implemented for `i32`
However, that's not usually how people describe multiplication. People
usually describe multiplication like how the division error words it:
error[E0277]: cannot divide `i32` by `f32`
--> src/lib.rs:2:7
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2 | x / y
| ^ no implementation for `i32 / f32`
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= help: the trait `Div<f32>` is not implemented for `i32`
So that's what this change does. It changes this:
error[E0277]: cannot multiply `f32` to `i32`
--> src/lib.rs:2:7
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2 | x * y
| ^ no implementation for `i32 * f32`
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= help: the trait `Mul<f32>` is not implemented for `i32`
To this:
error[E0277]: cannot multiply `i32` by `f32`
--> src/lib.rs:2:7
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2 | x * y
| ^ no implementation for `i32 * f32`
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= help: the trait `Mul<f32>` is not implemented for `i32`
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Verify that the binop trait *is* implemented for the types *if* all the
involved type parameters are replaced with fresh inferred types. When
this is the case, it means that the type parameter was indeed missing a
trait bound. If this is not the case, provide a generic `note` refering
to the type that doesn't implement the expected trait.
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* Suggest potentially missing binop trait bound (fix #73416)
* Use structured suggestion for dereference in binop
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Update tests
Extend to other operations
Refractor check in a separate function
Fix more tests
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