normal	2018-07-04 10:26:36 +0900 (Wed, 04 Jul 2018)

  New Revision: 63847

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63847

  Log:
    internal.h (rb_warning_string): use PRINTF_ARGS
    
    Let compilers do a little extra validation for us

  Modified files:
    trunk/internal.h
Index: internal.h
===================================================================
--- internal.h	(revision 63846)
+++ internal.h	(revision 63847)
@@ -1249,7 +1249,7 @@ NORETURN(void ruby_deprecated_internal_f https://github.com/ruby/ruby/blob/trunk/internal.h#L1249
 #define DEPRECATED_INTERNAL_FEATURE(func) \
     (ruby_deprecated_internal_feature(func), UNREACHABLE)
 VALUE rb_warning_warn(VALUE mod, VALUE str);
-VALUE rb_warning_string(const char *fmt, ...);
+PRINTF_ARGS(VALUE rb_warning_string(const char *fmt, ...), 1, 2);
 
 /* eval.c */
 VALUE rb_refinement_module_get_refined_class(VALUE module);

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