More carefulness in the error messages

1 files changed, 9 insertions, 3 deletions

diff --git a/c/_cffi_backend.c b/c/_cffi_backend.c
index 2ca89be..b92bbe9 100644
--- a/c/_cffi_backend.c
+++ b/c/_cffi_backend.c
@@ -4758,11 +4758,17 @@ static ffi_type *fb_fill_type(struct funcbuilder_s *fb, CTypeDescrObject *ct,
         }
         return ffistruct;
     }
-    else {
+    else if (ct->ct_flags & CT_UNION) {
         PyErr_Format(PyExc_NotImplementedError,
-                     "ctype '%s' (size %zd) not supported as %s.  "
+                     "ctype '%s' not supported as %s.  "
                      "Unions" SUPPORTED_IN_API_MODE,
-                     ct->ct_name, ct->ct_size, place, place);
+                     ct->ct_name, place, place);
+        return NULL;
+    }
+    else {
+        PyErr_Format(PyExc_NotImplementedError,
+                     "ctype '%s' (size %zd) not supported as %s",
+                     ct->ct_name, ct->ct_size, place);
         return NULL;
     }
 }