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-rw-r--r--src/GF/Grammar/PrGrammar.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/GF/Grammar/PrGrammar.hs b/src/GF/Grammar/PrGrammar.hs
index ffa6581cf..c49553425 100644
--- a/src/GF/Grammar/PrGrammar.hs
+++ b/src/GF/Grammar/PrGrammar.hs
@@ -71,6 +71,7 @@ instance Print A.Case where prt = C.printTree
instance Print A.CType where prt = C.printTree
instance Print A.Label where prt = C.printTree
instance Print A.Module where prt = C.printTree
+instance Print A.Canon where prt = C.printTree
instance Print A.Sort where prt = C.printTree
instance Print A.Atom where