michael@0: // Test that the same saved stack is only ever allocated once.
michael@0: 
michael@0: const stacks = [];
michael@0: 
michael@0: for (let i = 0; i < 10; i++) {
michael@0:   stacks.push(saveStack());
michael@0: }
michael@0: 
michael@0: const s = stacks.pop();
michael@0: for (let stack of stacks) {
michael@0:   assertEq(s, stack);
michael@0: }