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-rw-r--r--src/GF/Source/PrintGF.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/GF/Source/PrintGF.hs b/src/GF/Source/PrintGF.hs
index ad9dd46c0..71bfe4dd6 100644
--- a/src/GF/Source/PrintGF.hs
+++ b/src/GF/Source/PrintGF.hs
@@ -402,6 +402,7 @@ instance Print Patt where
PSeq patt0 patt -> prPrec i 0 (concatD [prt 0 patt0 , doc (showString "+") , prt 1 patt])
PRep patt -> prPrec i 1 (concatD [prt 2 patt , doc (showString "*")])
PAs id patt -> prPrec i 1 (concatD [prt 0 id , doc (showString "@") , prt 2 patt])
+ PNeg patt -> prPrec i 1 (concatD [doc (showString "-") , prt 2 patt])
prtList es = case es of
[x] -> (concatD [prt 2 x])