Perhaps as follows? Besides, it seems that this was dead code before my
patch...
Martin
diff --git a/src/interp/format.boot b/src/interp/format.boot
index fc2de70..4748d9e 100644
--- a/src/interp/format.boot
+++ b/src/interp/format.boot
@@ -394,7 +394,7 @@ form2String1 u ==
lo := form2String1 first argl
argl := rest argl
(null argl) or null (first argl) => [lo, '".."]
- [lo, '"..", form2String1 first argl]
+ concat(lo, '"..", form2String1 first argl)
op = "MATRIX" => matrix2String argl
u1 is ["ROOT", arg1] =>
concat("sqrt(", appOrParen(arg1),")")
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