On Thursday, 10 June 2021 at 13:19:34 UTC, dokutoku wrote: > The reason seems to be that WCHAR should be mangled with > wcha_t, but it is mangled with chat16_t. Confirmed: https://issues.dlang.org/show_bug.cgi?id=22014 Wrt. `tagRECT`, this should come in handy (for a druntime fix): https://dlang.org/changelog/2.097.0.html#pragma-mangle-aggregate