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[ares] comment explaining why unifying equality does not, in fact, infinite loop

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This commit is contained in:
Edward Amsden 2023-01-30 19:27:41 -06:00
parent 9d97c2d29f
commit 223b946199
1 changed files with 7 additions and 0 deletions
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7
rust/ares/src/mem.rs
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@ -671,6 +671,13 @@ pub unsafe fn unifying_equality(stack: &mut NockStack, a: *mut Noun, b: *mut Nou
stack.reclaim_in_previous_frame::<(*mut Noun, *mut Noun)>();
continue;
} else {
/* THIS ISN'T AN INFINITE LOOP
* If we discover a disequality in either side, we will
* short-circuit the entire loop and reset the work stack.
*
* If both sides are equal, then we will discover pointer
* equality when we return and unify the cell.
*/
*(stack.alloc_in_previous_frame()) =
(x_cell.tail_as_mut(), y_cell.tail_as_mut());
*(stack.alloc_in_previous_frame()) =