# Does `mmodule` has a `main` method?
	private fun mmodule_main(mmodule: MModule): nullable SourceFile do
		for mclassdef in mmodule.mclassdefs do
			if mclassdef.name != "Sys" then continue
			for mpropdef in mclassdef.mpropdefs do
				if mpropdef.name == "main" then return mmodule.location.file
			end
		end
		return null
	end