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-rw-r--r--src/GF/Grammar/PatternMatch.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/GF/Grammar/PatternMatch.hs b/src/GF/Grammar/PatternMatch.hs
index 2ca8b21de..ecc34709b 100644
--- a/src/GF/Grammar/PatternMatch.hs
+++ b/src/GF/Grammar/PatternMatch.hs
@@ -77,6 +77,7 @@ isInConstantForm trm = case trm of
Abs _ _ -> True
App c a -> isInConstantForm c && isInConstantForm a
R r -> all (isInConstantForm . snd . snd) r
+ K _ -> True
Alias _ _ t -> isInConstantForm t
_ -> False ---- isInArgVarForm trm