Esteban Küber 2389830dea 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`
```

2017-04-11 15:45:00 -07:00

..

Cargo.toml

store typeck lints in the TypeckTables

2017-02-02 20:38:16 -05:00

diagnostic_builder.rs

Highlight and simplify mismatched types

2017-04-11 15:45:00 -07:00

diagnostic.rs

Highlight and simplify mismatched types

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emitter.rs

Merge ExpnId and SyntaxContext.

2017-03-29 00:41:10 +00:00

lib.rs

Highlight and simplify mismatched types

2017-04-11 15:45:00 -07:00

lock.rs

run rustfmt on librustc_errors folder

2016-10-18 23:13:02 +05:30

registry.rs

run rustfmt on librustc_errors folder

2016-10-18 23:13:02 +05:30

snippet.rs

store typeck lints in the TypeckTables

2017-02-02 20:38:16 -05:00

styled_buffer.rs

run rustfmt on librustc_errors folder

2016-10-18 23:13:02 +05:30