If the assertion goes into unwinding, the value will be leaked inside a panic.

[labyrinth-ssr]

rio/src/lazy.rs

Lines 79 to 84 in 319f7fb

	let value = (self.init)();
	let value_ptr = Box::into_raw(Box::new(value));
	let old = self.value.swap(value_ptr, SeqCst);
	assert!(old.is_null());

If the assert fails, the object value_ptr pointing to (which is on the heap) will leak.