mirror of https://github.com/rust-lang/rust
37 lines
694 B
Rust
37 lines
694 B
Rust
//@ run-pass
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#![allow(dead_code)]
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#![allow(unused_variables)]
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#![allow(unconditional_recursion)]
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// Check that we do not ICE when compiling this
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// macro, which reuses the expression `$id`
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#![feature(box_patterns)]
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struct Foo {
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a: isize
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}
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pub enum Bar {
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Bar1, Bar2(isize, Box<Bar>),
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}
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impl Foo {
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fn elaborate_stm(&mut self, s: Box<Bar>) -> Box<Bar> {
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macro_rules! declare {
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($id:expr, $rest:expr) => ({
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self.check_id($id);
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Box::new(Bar::Bar2($id, $rest))
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})
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}
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match s {
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box Bar::Bar2(id, rest) => declare!(id, self.elaborate_stm(rest)),
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_ => panic!()
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}
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}
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fn check_id(&mut self, s: isize) { panic!() }
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}
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pub fn main() { }
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