rust/src/test/compile-fail/issue-14221.rs
Jakub Bukaj 5804a30686 Warn on pattern bindings that have the same name as a variant
...of the type being matched.

This change will result in a better diagnostic for code like the following:

```rust
enum Enum {
    Foo,
    Bar
}

fn f(x: Enum) {
    match x {
        Foo => (),
        Bar => ()
    }
}
```

which would currently simply fail with an unreachable pattern error
on the 2nd arm.

The user is advised to either use a qualified path in the patterns
or import the variants explicitly into the scope.
2014-11-26 22:21:52 +00:00

28 lines
849 B
Rust

// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
pub enum E {
A,
B,
}
pub mod b {
pub fn key(e: ::E) -> &'static str {
match e {
A => "A",
//~^ WARN pattern binding `A` is named the same as one of the variants of the type `E`
B => "B", //~ ERROR: unreachable pattern
//~^ WARN pattern binding `B` is named the same as one of the variants of the type `E`
}
}
}
fn main() {}