Add field name to array parse failure message

layout/types/array.c

@@ -29,7 +29,7 @@ static bool array_reader( struct json_pull_parser* jpp, void* field_data, struct
 			}
 		}
 
-		printf( "Parse failed, not an array\n" );
+		printf( "Parse of field %s failed, not an array\n", layout_field_data->key );
 		return false;
 	}