diff -r 0a10f142299d -r 8fa2b5c85a46 tests/test-fileset.t
--- a/tests/test-fileset.t	Sat May 19 18:43:13 2018 +0530
+++ b/tests/test-fileset.t	Sat May 19 18:45:53 2018 +0530
@@ -434,7 +434,7 @@
   > from mercurial import registrar
   > 
   > filesetpredicate = registrar.filesetpredicate()
-  > @filesetpredicate('existingcaller()', callexisting=False)
+  > @filesetpredicate(b'existingcaller()', callexisting=False)
   > def existingcaller(mctx, x):
   >     # this 'mctx.existing()' invocation is unintentional
   >     return [f for f in mctx.existing()]