if (scope != Qnil) {
	    if (rb_obj_is_kind_of(scope, rb_cBinding)) {
		GetBindingPtr(scope, bind);
		envval = bind->env;
		if (strcmp(file, "(eval)") == 0 && bind->path != Qnil) {
		    file = RSTRING_PTR(bind->path);
		    line = bind->first_lineno;
		}
	    }
	    else {
		rb_raise(rb_eTypeError,
			 "wrong argument type %s (expected Binding)",
			 rb_obj_classname(scope));
	    }
	    GetEnvPtr(envval, env);
	    base_block = &env->block;
	}
	else {
	    rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(th, th->cfp);

	    if (cfp != 0) {
		block = *RUBY_VM_GET_BLOCK_PTR_IN_CFP(cfp);
		base_block = █
		base_block->self = self;
		base_block->iseq = cfp->iseq;	/* TODO */
	    }
	    else {
		rb_raise(rb_eRuntimeError, "Can't eval on top of Fiber or Thread");
	    }
	}