Merge pull request #511 from iij/pr-no-method-error-mesg

change the error message (NoMethodError, NameError)

src/class.c

@@ -852,7 +852,9 @@ mrb_method_search(mrb_state *mrb, struct RClass* c, mrb_sym mid)
 
   m = mrb_method_search_vm(mrb, &c, mid);
   if (!m) {
-    mrb_raisef(mrb, E_NOMETHOD_ERROR, "no method named %s\n", mrb_sym2name(mrb, mid));
+    mrb_raisef(mrb, E_NAME_ERROR, "undefined method '%s' for class %s",
+        mrb_sym2name(mrb, mid),
+        RSTRING_PTR(mrb_funcall(mrb, mrb_obj_value(c), "inspect", 0)));
   }
   return m;
 }
@@ -1008,7 +1010,9 @@ mrb_bob_missing(mrb_state *mrb, mrb_value mod)
   if (!SYMBOL_P(name)) {
     mrb_raise(mrb, E_TYPE_ERROR, "name should be a symbol");
   }
-  mrb_raisef(mrb, E_NOMETHOD_ERROR, "no method named %s", mrb_sym2name(mrb, mrb_symbol(name)));
+  mrb_raisef(mrb, E_NOMETHOD_ERROR, "undefined method '%s' for %s",
+      mrb_sym2name(mrb, mrb_symbol(name)),
+      RSTRING_PTR(mrb_funcall(mrb, mod, "inspect", 0)));
   /* not reached */
   return mrb_nil_value();
 }