`||=` with cvars and constants should work with false values; #3138

mrbgems/mruby-compiler/core/parse.y

@@ -709,14 +709,13 @@ new_masgn(parser_state *p, node *a, node *b)
 static node*
 new_op_asgn(parser_state *p, node *a, mrb_sym op, node *b)
 {
+  node *n = list4((node*)NODE_OP_ASGN, a, nsym(op), b);
   if (op == mrb_intern_lit(p->mrb, "||") &&
       ((intptr_t)a->car == NODE_CONST || (intptr_t)a->car == NODE_CVAR)) {
-    return new_rescue(p, a, list1(list3(list1(new_const(p, mrb_intern_lit(p->mrb, "NameError"))),
+    return new_rescue(p, n, list1(list3(list1(new_const(p, mrb_intern_lit(p->mrb, "NameError"))),
                                         0, new_asgn(p, a, b))), NULL);
   }
-  else {
-    return list4((node*)NODE_OP_ASGN, a, nsym(op), b);
-  }
+  return n;
 }
 
 /* (:int . i) */