tail call causes memory leak in certain circumstances

The following code

use std;
import std._vec;

fn inner(vec[int] dummy, int t) -> int {
  if (t > 0) {
    be inner(dummy, t - 1);
  }
  else {
    ret 0;
  }
}

fn main() {
  inner(vec(1), 1);
}

gives rt: fatal, 'leaked memory in rust main loop (1 objects)' failed, rt/memory_region.cpp:99 1 objects Without the 'dummy' vector it is OK, i.e. fn inner(int t) -> int { if (t > 0) { be inner(t - 1); } else { ret 0; } }

fn main() {
  inner(1);
}

1. Ah, it's leaking the argument slots to the slot the tail-call is originating from. Nice minimal case, thanks!

   Found the problem, adding further-reduced test plus fix shortly.

   Graydon Hoare at 2010-09-13 20:36:26

2. Er, the function the tail-call is originating from. Sigh, mondays.

   Graydon Hoare at 2010-09-13 20:36:52

3. Fix leaking arg slots on tail calls. Closed by bc646d01c501f2566fd78057e23c283cfedc0eb0.

   Graydon Hoare at 2010-09-13 20:37:34