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```
warning: `<` is interpreted as a start of generic arguments for `usize`, not comparison
--> $DIR/issue-22644.rs:16:33
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16 | println!("{}", a as usize < b);
| ^ expected one of `!`, `(`, `+`, `,`, `::`, or `>` here
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help: if you want to compare the casted value then write
| println!("{}", (a as usize) < b);
```
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When the trait's span is available, it is already being used, add a
`note` for the cases where the span isn't available:
```
error[E0053]: method `fmt` has an incompatible type for trait
--> $DIR/trait_type.rs:17:4
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17 | fn fmt(&self, x: &str) -> () { }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ types differ in mutability
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= note: expected type `fn(&MyType, &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error>`
found type `fn(&MyType, &str)`
error[E0050]: method `fmt` has 1 parameter but the declaration in trait `std::fmt::Display::fmt` has 2
--> $DIR/trait_type.rs:21:11
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21 | fn fmt(&self) -> () { }
| ^^^^^ expected 2 parameters, found 1
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= note: `fmt` from trait: `fn(&Self, &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error>`
error[E0186]: method `fmt` has a `&self` declaration in the trait, but not in the impl
--> $DIR/trait_type.rs:25:4
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25 | fn fmt() -> () { }
| ^^^^^^^^^^^^^^^^^^ expected `&self` in impl
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= note: `fmt` from trait: `fn(&Self, &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error>`
error[E0046]: not all trait items implemented, missing: `fmt`
--> $DIR/trait_type.rs:28:1
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28 | impl std::fmt::Display for MyType4 {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `fmt` in implementation
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= note: `fmt` from trait: `fn(&Self, &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error>`
```
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Shorten mismatched types errors by replacing subtypes that are not
different with `_`, and highlighting only the subtypes that are
different.
Given a file
```rust
struct X<T1, T2> {
x: T1,
y: T2,
}
fn foo() -> X<X<String, String>, String> {
X { x: X {x: "".to_string(), y: 2}, y: "".to_string()}
}
fn bar() -> Option<String> {
"".to_string()
}
```
provide the following output
```rust
error[E0308]: mismatched types
--> file.rs:6:5
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6 | X { x: X {x: "".to_string(), y: 2}, y: "".to_string()}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected struct `std::string::String`, found {integer}
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= note: expected type `X<X<_, std::string::String>, _>`
^^^^^^^^^^^^^^^^^^^ // < highlighted
found type `X<X<_, {integer}>, _>`
^^^^^^^^^ // < highlighted
error[E0308]: mismatched types
--> file.rs:6:5
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10 | "".to_string()
| ^^^^^^^^^^^^^^ expected struct `std::option::Option`, found `std::string::String`
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= note: expected type `Option<std::string::String>`
^^^^^^^ ^ // < highlighted
found type `std::string::String`
```
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Otherwise they are a "hidden output"
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