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-rw-r--r--src/algebra/op.spad.pamphlet2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/algebra/op.spad.pamphlet b/src/algebra/op.spad.pamphlet
index 383747bd..cb2b1731 100644
--- a/src/algebra/op.spad.pamphlet
+++ b/src/algebra/op.spad.pamphlet
@@ -452,7 +452,7 @@ CommonOperators(): Exports == Implementation where
operator(s)$OP
dpi l == '%pi::O
- dfact x == postfix("!"::Symbol::O, (ATOM(x)$Lisp => x; paren x))
+ dfact x == postfix("!"::Symbol::O, (not %pair?(x)$Foreign(Builtin) => x; paren x))
dquote l == prefix(quote(first(l)::O), rest l)
dgamma l == prefix(hconcat("|"::Symbol::O, overbar(" "::Symbol::O)), l)
setDummyVar(op, n) == setProperty(op, DUMMYVAR, n pretend None)