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Rollup merge of rust-lang#41946 - qnighy:disallow-dot-underscore-in-f…
…loat, r=petrochenkov Disallow ._ in float literal. This patch makes lexer stop parsing number literals before `._`, as well as before `.a`. Underscore itself is still allowed like in `4_000_000.000_000_`. Fixes a half part of rust-lang#41723. The other is `""_`.
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// Copyright 2017 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. | ||
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fn main() { | ||
let a = 42._; //~ ERROR unexpected token: `_` | ||
} |
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// Copyright 2017 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. | ||
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trait Tr : Sized { | ||
fn _method_on_numbers(self) {} | ||
} | ||
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impl Tr for i32 {} | ||
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fn main() { | ||
42._method_on_numbers(); | ||
} |