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-rw-r--r--lib/ur/basis.urs1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/ur/basis.urs b/lib/ur/basis.urs
index c9d6556b..c893e65d 100644
--- a/lib/ur/basis.urs
+++ b/lib/ur/basis.urs
@@ -80,6 +80,7 @@ val ord : char -> int
val chr : int -> char
val iscodepoint : int -> bool
+val issingle : char -> bool
(** String operations *)