ddb2466f6a
followed by a semicolon.
This allows code like `vec![1i, 2, 3].len();` to work.
This breaks code that uses macros as statements without putting
semicolons after them, such as:
fn main() {
...
assert!(a == b)
assert!(c == d)
println(...);
}
It also breaks code that uses macros as items without semicolons:
local_data_key!(foo)
fn main() {
println("hello world")
}
Add semicolons to fix this code. Those two examples can be fixed as
follows:
fn main() {
...
assert!(a == b);
assert!(c == d);
println(...);
}
local_data_key!(foo);
fn main() {
println("hello world")
}
RFC #378.
Closes #18635.
[breaking-change]
76 lines
1.4 KiB
Rust
76 lines
1.4 KiB
Rust
// Copyright 2012-2014 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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#![feature(macro_rules)]
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macro_rules! mypat(
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() => (
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Some('y')
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)
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);
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macro_rules! char_x(
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() => (
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'x'
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)
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);
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macro_rules! some(
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($x:pat) => (
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Some($x)
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)
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);
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macro_rules! indirect(
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() => (
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some!(char_x!())
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)
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);
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macro_rules! ident_pat(
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($x:ident) => (
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$x
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)
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);
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fn f(c: Option<char>) -> uint {
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match c {
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Some('x') => 1,
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mypat!() => 2,
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_ => 3,
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}
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}
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pub fn main() {
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assert_eq!(1u, f(Some('x')));
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assert_eq!(2u, f(Some('y')));
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assert_eq!(3u, f(None));
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assert_eq!(1i, match Some('x') {
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Some(char_x!()) => 1i,
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_ => 2i,
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});
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assert_eq!(1i, match Some('x') {
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some!(char_x!()) => 1i,
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_ => 2i,
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});
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assert_eq!(1i, match Some('x') {
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indirect!() => 1i,
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_ => 2i,
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});
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assert_eq!(3i, {
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let ident_pat!(x) = 2i;
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x+1i
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});
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}
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