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]
44 lines
1000 B
Rust
44 lines
1000 B
Rust
// Copyright 2013-2014 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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// ignore-pretty - token trees can't pretty print
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// compile-flags: --cfg foo
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#![feature(macro_rules)]
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macro_rules! compiles_fine {
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($at:meta) => {
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#[cfg($at)]
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static MISTYPED: () = "foo";
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}
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}
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macro_rules! emit {
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($at:meta) => {
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#[cfg($at)]
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static MISTYPED: &'static str = "foo";
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}
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}
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// item
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compiles_fine!(bar);
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emit!(foo);
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fn foo() {
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println!("{}", MISTYPED);
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}
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pub fn main() {
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// statement
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compiles_fine!(baz);
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emit!(baz);
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println!("{}", MISTYPED);
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}
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