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-rw-r--r--test/unit/kernel/EphemeralRelation.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/unit/kernel/EphemeralRelation.ml b/test/unit/kernel/EphemeralRelation.ml
index f75fd0d..c604c3e 100644
--- a/test/unit/kernel/EphemeralRelation.ml
+++ b/test/unit/kernel/EphemeralRelation.ml
@@ -124,6 +124,7 @@ let releasing_a_derivation_releases_its_inputs () =
let released = ref false in
let input =
object
+ method to_string = "input"
method reference = true
method release = released := true
method hash = Concepts.Hash.hash_of_int 0