| // Copyright 2018 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. |
| |
| // In expression, `&a..=b` is treated as `(&a)..=(b)` and `box a..=b` is |
| // `(box a)..=(b)`. In a pattern, however, `&a..=b` means `&(a..=b)`. This may |
| // lead to confusion. |
| // |
| // We are going to disallow `&a..=b` and `box a..=b` in a pattern. However, the |
| // older ... syntax is still allowed as a stability guarantee. |
| |
| #![feature(box_patterns)] |
| #![warn(ellipsis_inclusive_range_patterns)] |
| |
| |
| pub fn main() { |
| match &12 { |
| &0...9 => {} |
| //~^ WARN `...` range patterns are deprecated |
| //~| HELP use `..=` for an inclusive range |
| &10..=15 => {} |
| //~^ ERROR the range pattern here has ambiguous interpretation |
| //~^^ HELP add parentheses to clarify the precedence |
| &(16..=20) => {} |
| _ => {} |
| } |
| |
| match Box::new(12) { |
| box 0...9 => {} |
| //~^ WARN `...` range patterns are deprecated |
| //~| HELP use `..=` for an inclusive range |
| box 10..=15 => {} |
| //~^ ERROR the range pattern here has ambiguous interpretation |
| //~^^ HELP add parentheses to clarify the precedence |
| box (16..=20) => {} |
| _ => {} |
| } |
| } |
