Need to check number of argument of Struct#new; fix #3823

mrbgems/mruby-struct/src/struct.c

@@ -283,17 +283,21 @@ mrb_struct_s_def(mrb_state *mrb, mrb_value klass)
   name = mrb_nil_value();
   mrb_get_args(mrb, "*&", &argv, &argc, &b);
   if (argc == 0) { /* special case to avoid crash */
-    rest = mrb_ary_new(mrb);
+    mrb_raise(mrb, E_ARGUMENT_ERROR, "wrong number of arguments");
   }
   else {
-    if (argc > 0) name = argv[0];
-    pargv = &argv[1];
-    argcnt = argc-1;
-    if (!mrb_nil_p(name) && mrb_symbol_p(name)) {
-      /* 1stArgument:symbol -> name=nil rest=argv[0]-[n] */
-      name = mrb_nil_value();
-      pargv = &argv[0];
-      argcnt++;
+    pargv = argv;
+    argcnt = argc;
+    if (argc > 0) {
+      name = argv[0];
+      if (mrb_symbol_p(name)) {
+        /* 1stArgument:symbol -> name=nil rest=argv[0..n] */
+        name = mrb_nil_value();
+      }
+      else {
+        pargv++;
+        argcnt--;
+      }
     }
     rest = mrb_ary_new_from_values(mrb, argcnt, pargv);
     for (i=0; i<RARRAY_LEN(rest); i++) {

mrbgems/mruby-struct/test/struct.rb

@@ -11,13 +11,6 @@ assert('Struct.new', '15.2.18.3.1') do
   assert_equal [:m1, :m2], c.members
 end
 
-# Check crash bug with Struc.new and no params.
-assert('Struct.new', '15.2.18.3.1') do
-  c = Struct.new()
-  assert_equal Struct, c.superclass
-  assert_equal [], c.members
-end
-
 assert('Struct#==', '15.2.18.4.1') do
   c = Struct.new(:m1, :m2)
   cc1 = c.new(1,2)
@@ -192,7 +185,7 @@ assert("Struct.new generates subclass of Struct") do
   begin
     original_struct = Struct
     Struct = String
-    assert_equal original_struct, original_struct.new.superclass
+    assert_equal original_struct, original_struct.new(:foo).superclass
   ensure
     Struct = original_struct
   end