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Auto merge of #34032 - jseyfried:load_macros_in_expansion, r=nrc
Support `#[macro_use]` on macro-expanded crates This PR loads macros from `#[macro_use]` crates during expansion so that - macro-expanded `#[macro_use]` crates work (fixes #33936, fixes #28071), and - macros imported from crates have the same scope as macros imported from modules. This is a [breaking-change]. For example, this will break: ```rust macro_rules! m { () => { #[macro_use(foo)] extern crate core; } //~ ERROR imported macro not found } m!(); ``` Also, this will break: ```rust macro_rules! try { () => {} } // #[macro_use] mod bar { macro_rules! try { ... } } //< ... just like this would ... fn main() { try!(); } //< ... making this an error ``` r? @nrc
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Original file line number | Diff line number | Diff line change |
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// Copyright 2016 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. | ||
|
||
#![feature(rustc_private)] | ||
macro_rules! m { | ||
() => { #[macro_use] extern crate syntax; } | ||
} | ||
m!(); | ||
|
||
fn main() { | ||
help!(); //~ ERROR unexpected end of macro invocation | ||
} |
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