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-rw-r--r--src/compiler/GF/Compile/Update.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/compiler/GF/Compile/Update.hs b/src/compiler/GF/Compile/Update.hs
index 143a4f96f..93e281b6a 100644
--- a/src/compiler/GF/Compile/Update.hs
+++ b/src/compiler/GF/Compile/Update.hs
@@ -29,7 +29,7 @@ import Control.Monad
import GF.Text.Pretty
-- | combine a list of definitions into a balanced binary search tree
-buildAnyTree :: Monad m => ModuleName -> [(Ident,Info)] -> m (Map.Map Ident Info)
+buildAnyTree :: MonadFail m => ModuleName -> [(Ident,Info)] -> m (Map.Map Ident Info)
buildAnyTree m = go Map.empty
where
go map [] = return map