Closed
Description
Rustc runs out of memory when parsing this (faulty) code:
#[macro_export]
macro_rules! self_referencing {
($sname:ty, { $( $field:ident = $val:expr; )* }) => {{
use std::ptr;
use std::mem;
use std::sync::Arc;
let mut arc = Arc::new($sname {
$( $field: unsafe { mem::uninitialized() } ),*
});
let mut pointer: *mut $sname = Arc::get_mut(&mut arc).unwrap();
{$(
println!("m1 {}", stringify!($field));
let $field = $val;
println!("m2");
unsafe { ptr::write(&mut (*pointer).$field, $field); }
println!("m3");
let $field = & unsafe { &(*pointer).$field };
println!("m4");
)*}
arc
}};
}
#[cfg(test)]
#[allow(dead_code)]
#[allow(unused_variables)]
#[allow(unused_mut)]
mod tests {
#[test]
fn struct_names() {
struct S1 {}
struct S2 {}
self_referencing!(S1, {});
self_referencing!(S2, {});
}
}I ran this command:
$ RUST_BACKTRACE=1 cargo test
Compiling self-ref v0.1.1 (file:///D:/Programming/Projects/Mine/self-ref)
src\lib.rs:8:32: 8:38 error: unexpected token: `S1`
src\lib.rs:8 let mut arc = Arc::new($sname {
^~~~~~
src\lib.rs:8:39: 8:40 error: expected one of `.`, `;`, `?`, or an operator, found `{`
src\lib.rs:8 let mut arc = Arc::new($sname {
^
Then it allocated extreme amounts of memory and after a few minutes this happened:
fatal runtime error: out of memory
error: Could not compile `self-ref`.
Meta
rustc 1.10.0-nightly (ed7c56796 2016-04-17)
binary: rustc
commit-hash: ed7c56796ef17f13227a50dc1a72a018b1d5e33f
commit-date: 2016-04-17
host: x86_64-pc-windows-gnu
release: 1.10.0-nightly
The same thing happens on 1.8 stable GNU, though.