Reader: Raise an exception when encountering a package marker that does not designate an existing package.

1 files changed, 6 insertions, 0 deletions

diff --git a/MLKReader.m b/MLKReader.m
index 8784f30..68db172 100644
--- a/MLKReader.m
+++ b/MLKReader.m
@@ -449,6 +449,12 @@
         {
           package = [MLKPackage
                       findPackage:[token substringToIndex:packageMarker]];
+
+          if (!package)
+            [NSException raise:@"MLKReaderError"
+                         format:@"Can't find package %@.",
+                         [token substringToIndex:packageMarker]];
+
           if ([readtable isPackageMarker:[token characterAtIndex:(i+1)]])
             symbolName = [token substringFromIndex:(packageMarker+2)];
           else