Rustc hangs and consumes all cpu and memory after finding illegal borrow.

[jakerr]

I'm sorry, I haven't had the chance to check this on latest incoming so may already be fixed.

Version info:
rustc 0.6 (09bb07b 2012-12-24 18:29:02 -0800)
host: x86_64-apple-darwin

rustc hangs, consumes 100% CPU, and eventually 100% of memory when trying to compile this invalid program:

fn main() {
  let mut orig = @1;
  let mut borrow = &*orig;
  io::println(fmt!("before mutate, orig: %? borrow: %?", orig, borrow));
  orig = @2;
  borrow = &3; // Error here.
  io::println(fmt!("after mutate,  orig: %? borrow: %?", orig, borrow));
}

The error is reported like so:

$ rustc try.rs 
try.rs:6:12: 6:13 error: illegal borrow: borrowed value does not live long enough
try.rs:6   borrow = &3; // Error here.
                     ^
try.rs:1:10: 1:0 note: borrowed pointer must be valid for the block at 1:10...
try.rs:1 fn main() {

And then rustc hangs.

[bstrie]

I tried this this morning on incoming and couldn't reproduce it. When you get the chance, I encourage you to try checking out a more recent build of Rust to see if this still manifests.

[jakerr]

Appears fixed.
Verified in:
rustc 0.6 (dd41f04 2013-02-08 00:10:49 -0800)
host: x86_64-apple-darwin