https://issues.dlang.org/show_bug.cgi?id=23175
--- Comment #9 from Mathias LANG <[email protected]> --- > I do not think we need to change the semantics of preview=in, or to disable > optimizations based on it. What we need is a warning to tell the user that > what he wrote before, while valid with the previous compiler, has memory > corruption implications now that the semantics have changed. You should have led with this. That's what `-transition` is for. It lists all instances of `in` usage so you can inspect them. --
