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-rw-r--r--src/compiler/GF/Compile/Compute/AppPredefined.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/compiler/GF/Compile/Compute/AppPredefined.hs b/src/compiler/GF/Compile/Compute/AppPredefined.hs
index 42d53c3c2..d15d57001 100644
--- a/src/compiler/GF/Compile/Compute/AppPredefined.hs
+++ b/src/compiler/GF/Compile/Compute/AppPredefined.hs
@@ -107,6 +107,7 @@ appPredefined t = case t of
(K s) | f == cIsUpper -> retb $ if (all isUpper s) then predefTrue else predefFalse
(K s) | f == cToUpper -> retb $ K $ map toUpper s
(K s) | f == cToLower -> retb $ K $ map toLower s
+ (K s) | f == cError -> retb $ Error s
_ -> retb t