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	lua.set_function("renderBackCard",[](tk::image::Ptr backImage, int borderSize, unsigned char r, unsigned char g, unsigned char b) {
		auto brush = tk::Brush({r,g,b});
		auto imgRect = tk::Rect::closed({},backImage->dims() + tk::WDims::squared(borderSize*2));
		auto image = tk::image::create(tk::image::Params(tk::image::Type::BGRA,imgRect.dims()));
		auto & imageCanvas = image->beginDraw();
		imageCanvas.fillRect(imgRect,brush);
		backImage->drawInto(imageCanvas,tk::Point(borderSize,borderSize));
		image->endDraw();
		return image;
	});
 

prog.cpp:1:2: error: ‘lua’ does not name a type
  lua.set_function("renderBackCard",[](tk::image::Ptr backImage, int borderSize, unsigned char r, unsigned char g, unsigned char b) {
  ^~~
prog.cpp:10:3: error: expected unqualified-id before ‘)’ token
  });
   ^

Standard output is empty