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/file.c b/file.c
index ccfb3c1850..f9237b042a 100644
--- a/file.c
+++ b/file.c
@@ -5433,6 +5433,7 @@ rb_f_test(int argc, VALUE *argv, VALUE _)
     else {
         rb_raise(rb_eArgError, "unknown command \"\\x%02X\"", cmd);
     }
+    UNREACHABLE_RETURN(Qundef);
 }