add UNREACHABLE_RETURN

Not every compilers understand that rb_raise does not return.  When a
function does not end with a return statement, such compilers can issue
warnings.  We would better tell them about reachabilities.

1 files changed, 1 insertions, 0 deletions

diff --git a/error.c b/error.c
index 5cb808fb44..ce936ac568 100644
--- a/error.c
+++ b/error.c
@@ -930,6 +930,7 @@ rb_check_typeddata(VALUE obj, const rb_data_type_t *data_type)
     const char *expected = data_type->wrap_struct_name;
     rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE" (expected %s)",
              actual, expected);
+    UNREACHABLE_RETURN(NULL);
 }
 
 /* exception classes */