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-rw-r--r--lib/ur/top.urs2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/ur/top.urs b/lib/ur/top.urs
index a32a87a3..29b34b10 100644
--- a/lib/ur/top.urs
+++ b/lib/ur/top.urs
@@ -12,6 +12,8 @@ structure Folder : sig
-> [[nm] ~ r] => folder r -> folder ([nm = v] ++ r)
val concat : K --> r1 ::: {K} -> r2 ::: {K}
-> [r1 ~ r2] => folder r1 -> folder r2 -> folder (r1 ++ r2)
+ val mp : K1 --> K2 --> f ::: (K1 -> K2) -> r ::: {K1}
+ -> folder r -> folder (map f r)
end