clean: make some classes abstract or interfaces

[nit.git] / lib / filter_stream.nit

diff --git a/lib/filter_stream.nit b/lib/filter_stream.nit
index 66366c6..5286c7c 100644 (file)
--- a/lib/filter_stream.nit
+++ b/lib/filter_stream.nit
@@ -14,7 +14,7 @@
 class FilterIStream
        super IStream
        # Filter readed elements
-       readable var _stream: nullable IStream
+       readable var _stream: nullable IStream = null
 
        redef fun eof: Bool
        do
@@ -31,7 +31,7 @@ end
 class FilterOStream
        super OStream
        # Filter outputed elements
-       readable var _stream: nullable OStream
+       readable var _stream: nullable OStream = null
 
        # Can the stream be used to write
        redef fun is_writable: Bool