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-rw-r--r--compiler/coreSyn/CoreFVs.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/coreSyn/CoreFVs.hs b/compiler/coreSyn/CoreFVs.hs
index 7fcff90c71..7e7727164c 100644
--- a/compiler/coreSyn/CoreFVs.hs
+++ b/compiler/coreSyn/CoreFVs.hs
@@ -379,7 +379,7 @@ orphNamesOfCo (AxiomInstCo con _ cos) = orphNamesOfCoCon con `unionNameSet` orph
orphNamesOfCo (UnivCo p _ t1 t2) = orphNamesOfProv p `unionNameSet` orphNamesOfType t1 `unionNameSet` orphNamesOfType t2
orphNamesOfCo (SymCo co) = orphNamesOfCo co
orphNamesOfCo (TransCo co1 co2) = orphNamesOfCo co1 `unionNameSet` orphNamesOfCo co2
-orphNamesOfCo (NthCo _ co) = orphNamesOfCo co
+orphNamesOfCo (NthCo _ _ co) = orphNamesOfCo co
orphNamesOfCo (LRCo _ co) = orphNamesOfCo co
orphNamesOfCo (InstCo co arg) = orphNamesOfCo co `unionNameSet` orphNamesOfCo arg
orphNamesOfCo (CoherenceCo co1 co2) = orphNamesOfCo co1 `unionNameSet` orphNamesOfCo co2