Hi all, With Opal, if you want to customize how methods are compiled into a class you can override #compilerClass on class-side: MyClass class>>#compilerClass ^ MySpecialCompiler However this custom compiler is not taken into account when compiling methods on the class-side: MyClass class compilerClass ---> OpalCompiler I was expecting to have the same compiler class for the metaclass. The consequence is that right now there is no way to specialize how methods are compiled in *one* metaclass. Is it on purpose or is it a bug? Also is there cases where one wants instance-side methods and class-side methods to be compiled with different compiler classes? My rough guess is that in most cases you want the same compiler class, but I don't fell confortable forcing that. So I propose to add a method #classSideCompilerClass: Class>>#classSideCompilerClass ^ self compilerClass Then compilerClass can be implemented for metaclasses: Metaclass>>#compilerClass ^ self instanceSide classSideCompilerClass Likewise, if I override compilerClass, it is taken into account for both instance-side and class-side methods but I can still say that I want a different compiler for class-side methods by overriding classSideCompilerClass. Tell me what you think about it and if you're ok, I open a bug entry with the slice. Cheers, Camille