f4039affa3
When missing a comma in a macro call, suggest it, regardless of position. When a macro call doesn't match any of the patterns, check if the call's token stream could be missing a comma between two idents, and if so, create a new token stream containing the comma and try to match against the macro patterns. If successful, emit the suggestion.
30 lines
1 KiB
Rust
30 lines
1 KiB
Rust
// Copyright 2018 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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macro_rules! foo {
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($a:ident) => ();
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($a:ident, $b:ident) => ();
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($a:ident, $b:ident, $c:ident) => ();
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($a:ident, $b:ident, $c:ident, $d:ident) => ();
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($a:ident, $b:ident, $c:ident, $d:ident, $e:ident) => ();
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}
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fn main() {
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println!("{}" a);
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//~^ ERROR expected token: `,`
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foo!(a b);
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//~^ ERROR no rules expected the token `b`
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foo!(a, b, c, d e);
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//~^ ERROR no rules expected the token `e`
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foo!(a, b, c d, e);
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//~^ ERROR no rules expected the token `d`
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foo!(a, b, c d e);
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//~^ ERROR no rules expected the token `d`
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}
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