On Tuesday, 26 January 2016 at 13:56:39 UTC, Igor wrote:
//ubyte[__traits(classInstanceSize, App)] buffer;auto buffer = core.stdc.stdlib.malloc(__traits(classInstanceSize, App))[0..__traits(classInstanceSize, App)];works, so it is the ubyte line.
Can you please post the full code? From your description, it looks like the stack frame might get invalidated...