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-rw-r--r--src/compiler/GF/Compile/GrammarToPGF.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/compiler/GF/Compile/GrammarToPGF.hs b/src/compiler/GF/Compile/GrammarToPGF.hs
index e10a2b13b..5ec7f9774 100644
--- a/src/compiler/GF/Compile/GrammarToPGF.hs
+++ b/src/compiler/GF/Compile/GrammarToPGF.hs
@@ -261,7 +261,7 @@ genCncFuns gr am cm seqs0 cdefs fid_cnt cnccats =
mkFId (_,cat) fid0 =
case Map.lookup (i2i cat) cnccats of
Just (C.CncCat s e _) -> s+fid0
- Nothing -> error "GrammarToPGF.mkFId failed"
+ Nothing -> error ("GrammarToPGF.mkFId: missing category "++showIdent cat)
mkCtxt lindefs (_,cat) =
case Map.lookup (i2i cat) cnccats of