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-rw-r--r--src/algebra/formula.spad.pamphlet2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/algebra/formula.spad.pamphlet b/src/algebra/formula.spad.pamphlet
index 384fad69..a39f786d 100644
--- a/src/algebra/formula.spad.pamphlet
+++ b/src/algebra/formula.spad.pamphlet
@@ -398,7 +398,7 @@ ScriptFormulaFormat(): public == private where
formatFormula(expr,prec) ==
i : Integer
- ATOM(expr)$Lisp pretend Boolean =>
+ not %pair?(expr)$Foreign(Builtin) =>
str := stringify expr
%integer?(expr)$Foreign(Builtin) =>
i := expr : Integer