stdlib: fixed lemma map.Occ.occ_exchange

parent 53bba4a2
......@@ -160,7 +160,7 @@ module Occ
lemma occ_exchange :
forall m: map int 'a, l u i j: int, x y z: 'a.
l <= i < u -> l <= j < u ->
l <= i < j < u ->
occ z m[i <- x][j <- y] l u =
occ z m[i <- y][j <- x] l u
......
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