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-rw-r--r--include/ruby/internal/value_type.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/include/ruby/internal/value_type.h b/include/ruby/internal/value_type.h
index 6adbd35c44..aedd0abe4b 100644
--- a/include/ruby/internal/value_type.h
+++ b/include/ruby/internal/value_type.h
@@ -96,7 +96,12 @@
#define RB_TYPE_P RB_TYPE_P
#define Check_Type Check_Type
-#define RBIMPL_ASSERT_TYPE(v, t) RBIMPL_ASSERT_OR_ASSUME(RB_TYPE_P((v), (t)))
+#ifdef RBIMPL_VA_OPT_ARGS
+# define RBIMPL_ASSERT_TYPE(v, t) \
+ RBIMPL_ASSERT_OR_ASSUME(RB_TYPE_P(v, t), "actual type: %d", rb_type(v))
+#else
+# define RBIMPL_ASSERT_TYPE(v, t) RBIMPL_ASSERT_OR_ASSUME(RB_TYPE_P(v, t))
+#endif
/** @endcond */
/** @old{rb_type} */