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-rw-r--r--src/reduce.sml2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/reduce.sml b/src/reduce.sml
index 95b26da8..cc8ba0fd 100644
--- a/src/reduce.sml
+++ b/src/reduce.sml
@@ -291,6 +291,8 @@ fun kindConAndExp (namedC, namedE) =
case (#1 c1, #1 c2) of
(CRecord (k, xcs1), CRecord (_, xcs2)) =>
(CRecord (kind env k, xcs1 @ xcs2), loc)
+ | (CRecord (_, []), _) => c2
+ | (_, CRecord (_, [])) => c1
| _ => (CConcat (c1, c2), loc)
end
| CMap (dom, ran) => (CMap (kind env dom, kind env ran), loc)