From cc2dca3bd0093f02c33e9a4d7489906bc8758c8d Mon Sep 17 00:00:00 2001
From: Maarten Billemont <lhunath@lyndir.com>
Date: Mon, 27 Apr 2020 16:32:30 -0400
Subject: [PATCH] Report missing support when trying to parse unknown format.

---
 platform-independent/c/core/src/mpw-marshal.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/platform-independent/c/core/src/mpw-marshal.c b/platform-independent/c/core/src/mpw-marshal.c
index 63f37880..80b4469b 100644
--- a/platform-independent/c/core/src/mpw-marshal.c
+++ b/platform-independent/c/core/src/mpw-marshal.c
@@ -1097,6 +1097,8 @@ MPMarshalledFile *mpw_marshal_read(
             info->format = MPMarshalFormatJSON;
 #if MPW_JSON
             mpw_marshal_read_json( file, in );
+#else
+            mpw_marshal_error( file, MPMarshalErrorFormat, "JSON support is not enabled." );
 #endif
         }
     }