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-rw-r--r--src/algebra/pattern.spad.pamphlet2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/algebra/pattern.spad.pamphlet b/src/algebra/pattern.spad.pamphlet
index c5a667e6..f3368758 100644
--- a/src/algebra/pattern.spad.pamphlet
+++ b/src/algebra/pattern.spad.pamphlet
@@ -343,7 +343,7 @@ Pattern(R:SetCategory): Exports == Implementation where
p.ker.tag = PAT_ZERO => 0::Integer::O
p.ker.tag = PAT_ONE => 1::Integer::O
l := [x::O for x in p.ker.arg]$List(O)
- (u:=display(p.ker.op)) case "failed" =>prefix(name(p.ker.op)::O,l)
+ (u:=display(p.ker.op)) case nothing =>prefix(name(p.ker.op)::O,l)
(u::(List O -> O)) l
patcopy p ==