58 lines
1.4 KiB
Rust
58 lines
1.4 KiB
Rust
// Copyright 2012 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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#![feature(box_patterns)]
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#![feature(slice_patterns)]
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#![feature(box_syntax)]
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#![feature(never_type)]
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#![deny(unreachable_patterns)]
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mod foo {
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pub struct SecretlyEmpty {
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_priv: !,
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}
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}
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struct NotSoSecretlyEmpty {
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_priv: !,
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}
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fn foo() -> Option<NotSoSecretlyEmpty> {
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None
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}
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fn main() {
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let x: &[!] = &[];
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match x {
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&[] => (),
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&[..] => (), //~ ERROR unreachable pattern
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};
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let x: Result<Box<NotSoSecretlyEmpty>, &[Result<!, !>]> = Err(&[]);
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match x {
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Ok(box _) => (), //~ ERROR unreachable pattern
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Err(&[]) => (),
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Err(&[..]) => (), //~ ERROR unreachable pattern
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}
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let x: Result<foo::SecretlyEmpty, Result<NotSoSecretlyEmpty, u32>> = Err(Err(123));
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match x {
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Ok(_y) => (),
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Err(Err(_y)) => (),
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Err(Ok(_y)) => (), //~ ERROR unreachable pattern
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}
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while let Some(_y) = foo() {
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//~^ ERROR unreachable pattern
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}
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}
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