def add_mixin(self, mixin):
raw = mixin.tokens[<NUM_LIT:0>][<NUM_LIT:0>].raw()<EOL>if raw in self._mixins:<EOL><INDENT>self._mixins[raw].append(mixin)<EOL><DEDENT>else:<EOL><INDENT>self._mixins[raw] = [mixin]<EOL><DEDENT>
Add mixin to scope
        Args:
            mixin (Mixin): Mixin object