36 lines
1.0 KiB
Rust
36 lines
1.0 KiB
Rust
// Copyright 2014 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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fn macros() {
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macro_rules! foo{
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($p:pat, $e:expr, $b:block) => {{
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while let $p = $e $b
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}}
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}
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macro_rules! bar{
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($p:pat, $e:expr, $b:block) => {{
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foo!($p, $e, $b)
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}}
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}
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foo!(a, 1, { //~ ERROR irrefutable while-let
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println!("irrefutable pattern");
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});
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bar!(a, 1, { //~ ERROR irrefutable while-let
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println!("irrefutable pattern");
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});
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}
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pub fn main() {
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while let a = 1 { //~ ERROR irrefutable while-let
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println!("irrefutable pattern");
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}
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}
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