-module { export = [main], chr }
+module { export = [main], features = [chr] }
import "StandardLibrary"
main = ()
where
X ?x => Y ?y
--
+6:7-6:9: Existential variable ?x is referred only once. Replace by _ if this is a wildcard.
6:15-6:17: New existential variables can be defined only in queries.
\ No newline at end of file