Classinfo and @nogc conflict

[solidstate1991]

I'm trying to speed up my graphic engine, however the presence of 
the GC in function Layer.updateRaster (see here: 
https://github.com/ZILtoid1991/pixelperfectengine/blob/master/pixelperfectengine/src/PixelPerfectEngine/graphics/layers.d ) means I get an occasional bump in CPU usage if not a framedrop (most performance related thing got fixed since then).

I use classinfo for detecting the type of bitmaps, and while I 
probably will have a workaround for the associative array stuff, 
the classinfo thing is embedded into the runtime library, thus it 
needs to be fixed. I took a look at opEquals, but the trickier 
part would be making the toString function @nogc (make its return 
value a ref type?).