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-rw-r--r--checker/type_errors.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/checker/type_errors.ml b/checker/type_errors.ml
index 565005b90..cb8888a4f 100644
--- a/checker/type_errors.ml
+++ b/checker/type_errors.ml
@@ -33,6 +33,7 @@ type guard_error =
| RecCallInCaseArg of constr
| RecCallInCasePred of constr
| NotGuardedForm of constr
+ | ReturnPredicateNotCoInductive of constr
type arity_error =
| NonInformativeToInformative