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-rw-r--r--internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index cb688f1897..f925f94825 100644
--- a/internal.h
+++ b/internal.h
@@ -95,6 +95,7 @@ NORETURN(PRINTF_ARGS(void rb_compile_bug(const char*, int, const char*, ...), 3,
VALUE rb_check_backtrace(VALUE);
NORETURN(void rb_async_bug_errno(const char *,int));
const char *rb_builtin_type_name(int t);
+const char *rb_builtin_class_name(VALUE x);
/* eval_error.c */
void ruby_error_print(void);