sequences: fix uses of set-nth-unsafe.

basis/bit-sets/bit-sets.factor

@@ -1,7 +1,7 @@
 ! Copyright (C) 2009 Slava Pestov.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: kernel accessors sequences byte-arrays bit-arrays math
-math.bitwise hints sets ;
+math.bitwise hints sets sequences.private ;
 IN: bit-sets
 
 TUPLE: bit-set { table bit-array read-only } ;

basis/unicode/data/data.factor

@@ -5,7 +5,8 @@ io.files hashtables quotations splitting grouping arrays io
 math.parser math.order byte-arrays namespaces math.bitwise
 compiler.units parser io.encodings.ascii interval-maps
 ascii sets combinators locals math.ranges sorting make
-strings.parser io.encodings.utf8 memoize simple-flat-file ;
+strings.parser io.encodings.utf8 memoize simple-flat-file
+sequences.private ;
 IN: unicode.data
 
 <PRIVATE

extra/maze/maze.factor

@@ -1,7 +1,7 @@
 ! From http://www.ffconsultancy.com/ocaml/maze/index.html
 USING: accessors arrays fry kernel math math.order math.vectors
 namespaces opengl.gl random sequences ui ui.gadgets
-ui.gadgets.canvas ui.render ;
+ui.gadgets.canvas ui.render sequences.private ;
 IN: maze
 
 CONSTANT: line-width 8