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Highlight and simplify mismatched types
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 | 6 | X { x: X {x: "".to_string(), y: 2}, y: "".to_string()} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected struct `std::string::String`, found {integer} | = note: expected type `X<X<_, std::string::String>, _>` ^^^^^^^^^^^^^^^^^^^ // < highlighted found type `X<X<_, {integer}>, _>` ^^^^^^^^^ // < highlighted error[E0308]: mismatched types --> file.rs:6:5 | 10 | "".to_string() | ^^^^^^^^^^^^^^ expected struct `std::option::Option`, found `std::string::String` | = note: expected type `Option<std::string::String>` ^^^^^^^ ^ // < highlighted found type `std::string::String` ```
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