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"Non-aligned pointer being freed" with port[tup(str)] #121

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@jyasskin

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@jyasskin
$ cat non_aligned_test.rs
obj dorder(chan[tup(str)] tracker, int order, str message) {
  drop {
    tracker <| tup(message);
  }
}
io fn main() {
  let port[tup(str)] tracker_p = port();
  {
    auto tracker = chan(tracker_p);
    auto msg = "Message";
    dorder(tracker, 0, msg);
    dorder(tracker, 0, "Other");
  }
  {
    chan(tracker_p) <| tup("");
  }
  while(true) {
    auto expected <- tracker_p;
    if (expected._0 == "") {
      ret;
    }
  }
}
$ ./rustboot -L . non_aligned_test.rs -o non_aligned_test
$ ./non_aligned_test 2>&1
non_aligned_test(71481,0xa0563720) malloc: *** error for object 0x10037f: Non-aligned pointer being freed
*** set a breakpoint in malloc_error_break to debug
Segmentation fault
$

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