raise a RuntimeError if the method is defined by `define_method' with…

… frozen class

spec/frozen/tags/macruby/core/module/define_method_tags.txt

@@ -5,4 +5,3 @@ fails:Module#define_method passed { |a, *b|  } creates a method that raises an A
 fails:Module#define_method passed { |a, b, *c|  } creates a method that raises an ArgumentError when passed zero arguments
 fails:Module#define_method passed { |a, b, *c|  } creates a method that raises an ArgumentError when passed one argument
 fails:Module#define_method passed { |a, b, *c|  } creates a method that raises an ArgumentError when passed one argument and a block
-fails:Module#define_method raises a RuntimeError if frozen

vm.cpp

@@ -2671,6 +2671,10 @@ __rb_vm_define_method(Class klass, SEL sel, IMP objc_imp, IMP ruby_imp,
 	return NULL;
     }
 
+    if (OBJ_FROZEN(klass)) {
+	rb_error_frozen("class/module");
+    }
+
     const char *sel_name = sel_getName(sel);
     const bool genuine_selector = sel_name[strlen(sel_name) - 1] == ':';
     int types_count = genuine_selector ? arity.real + 3 : 3;