https://issues.dlang.org/show_bug.cgi?id=23175
--- Comment #5 from Steven Schveighoffer <[email protected]> --- One further update, in Feb 2021, which is still there to this day, notes that the `in` storage class without the preview=in switch means `const`: https://github.com/dlang/dlang.org/commit/8f05cb00c99c90d88550972199c7941e2ea8ca21 --
