Fixed a filter() mistake.

Author: Rostepher

utils/build_swift/argparse/types.py

@@ -175,7 +175,7 @@ def __init__(self):
 
     def __call__(self, value):
         matches = super(ClangVersionType, self).__call__(value)
-        components = filter(None, matches.group(1, 2, 3, 5))
+        components = filter(lambda x: x is not None, matches.group(1, 2, 3, 5))
 
         return CompilerVersion(components)
 
@@ -195,7 +195,7 @@ def __init__(self):
 
     def __call__(self, value):
         matches = super(SwiftVersionType, self).__call__(value)
-        components = filter(None, matches.group(1, 2, 4))
+        components = filter(lambda x: x is not None, matches.group(1, 2, 4))
 
         return CompilerVersion(components)