vm_eval.c: refine messages

* vm_eval.c (raise_method_missing): refine error messages when a
  symbol is not given.  [Fix GH-1013]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51742 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 2 deletions

diff --git a/vm_eval.c b/vm_eval.c
index 00b47e5843..e12006af29 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -693,8 +693,13 @@ raise_method_missing(rb_thread_t *th, int argc, const VALUE *argv, VALUE obj,
     VALUE exc = rb_eNoMethodError;
     const char *format = 0;
 
-    if (argc == 0 || !SYMBOL_P(argv[0])) {
-	rb_raise(rb_eArgError, "no id given");
+    if (UNLIKELY(argc == 0)) {
+	rb_raise(rb_eArgError, "no method names given");
+    }
+    else if (UNLIKELY(!SYMBOL_P(argv[0]))) {
+	const VALUE e = rb_eArgError; /* TODO: TypeError? */
+	rb_raise(e, "method name must be a Symbol but %"PRIsVALUE" is given",
+		 rb_obj_class(argv[0]));
     }
 
     stack_check();