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-rw-r--r--src/elab.sml1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/elab.sml b/src/elab.sml
index 43837413..ea00d199 100644
--- a/src/elab.sml
+++ b/src/elab.sml
@@ -59,6 +59,7 @@ datatype con' =
| CRecord of kind * (con * con) list
| CConcat of con * con
+ | CFold of kind * kind
| CError
| CUnif of kind * string * con option ref