3dcd215740
This breaks code that referred to variant names in the same namespace as
their enum. Reexport the variants in the old location or alter code to
refer to the new locations:
```
pub enum Foo {
A,
B
}
fn main() {
let a = A;
}
```
=>
```
pub use self::Foo::{A, B};
pub enum Foo {
A,
B
}
fn main() {
let a = A;
}
```
or
```
pub enum Foo {
A,
B
}
fn main() {
let a = Foo::A;
}
```
[breaking-change]
54 lines
1.8 KiB
Rust
54 lines
1.8 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Constants (static variables) can be used to match in patterns, but mutable
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// statics cannot. This ensures that there's some form of error if this is
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// attempted.
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static mut a: int = 3;
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fn main() {
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// If they can't be matched against, then it's possible to capture the same
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// name as a variable, hence this should be an unreachable pattern situation
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// instead of spitting out a custom error about some identifier collisions
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// (we should allow shadowing)
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match 4i {
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a => {} //~ ERROR static variables cannot be referenced in a pattern
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_ => {}
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}
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}
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struct NewBool(bool);
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enum Direction {
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North,
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East,
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South,
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West
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}
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const NEW_FALSE: NewBool = NewBool(false);
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struct Foo {
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bar: Option<Direction>,
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baz: NewBool
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}
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static mut STATIC_MUT_FOO: Foo = Foo { bar: Some(Direction::West), baz: NEW_FALSE };
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fn mutable_statics() {
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match (Foo { bar: Some(Direction::North), baz: NewBool(true) }) {
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Foo { bar: None, baz: NewBool(true) } => (),
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STATIC_MUT_FOO => (),
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//~^ ERROR static variables cannot be referenced in a pattern
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Foo { bar: Some(Direction::South), .. } => (),
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Foo { bar: Some(EAST), .. } => (),
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Foo { bar: Some(Direction::North), baz: NewBool(true) } => (),
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Foo { bar: Some(EAST), baz: NewBool(false) } => ()
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}
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}
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