https://issues.dlang.org/show_bug.cgi?id=16106
--- Comment #1 from Don <clugd...@yahoo.com.au> --- To clarify: I'm asking for the situation where you call a fiber which is not in state HOLD, to be detected even when compiled without contracts. I'm not asking for fiber.call() to ever be a no-op. Ie, fiber.call() should either switch to a different fiber, or else it should halt execution. It should never cause stack corruption. --