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+(selective-load "mu.arc" section-level)
+(test-only-settings)
+(add-code:readfile "trace.mu")
+(ero "running tests in trace.arc.t (takes ~10 mins)")
+(freeze function*)
+(load-system-functions)
+
+(reset2)
+(new-trace "print-trace")
+(run-code main
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (x:string-address <- new
+"schedule: main
+run: main 0: (((1 integer)) <- ((copy)) ((1 literal)))
+run: main 0: 1 => ((1 integer))
+mem: ((1 integer)): 1 <= 1
+run: main 1: (((2 integer)) <- ((copy)) ((3 literal)))
+run: main 1: 3 => ((2 integer))
+mem: ((2 integer)): 2 <= 3
+run: main 2: (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))
+mem: ((1 integer)) => 1
+mem: ((2 integer)) => 3
+run: main 2: 4 => ((3 integer))
+mem: ((3 integer)): 3 <= 4
+schedule:  done with routine")
+  (s:stream-address <- init-stream x:string-address)
+  (traces:instruction-trace-address-array-address <- parse-traces s:stream-address)
+  (screen:terminal-address <- init-fake-terminal 70:literal 15:literal)
+  (browser-state:space-address <- browser-state traces:instruction-trace-address-array-address 30:literal/screen-height)
+  (print-traces-collapsed browser-state:space-address screen:terminal-address)
+  (1:string-address/raw <- get screen:terminal-address/deref data:offset)
+)
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+;? (prn memory*.1)
+(when (~screen-contains memory*.1 70
+         (+ "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "+ main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "+ main/ 2 : 4 => ((3 integer))                                        "))
+  (prn "F - print-traces-collapsed works"))
+;? (quit) ;? 1
+
+(reset2)
+(new-trace "print-trace-from-middle-of-screen")
+(run-code main
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (x:string-address <- new
+"schedule: main
+run: main 0: (((1 integer)) <- ((copy)) ((1 literal)))
+run: main 0: 1 => ((1 integer))
+mem: ((1 integer)): 1 <= 1
+run: main 1: (((2 integer)) <- ((copy)) ((3 literal)))
+run: main 1: 3 => ((2 integer))
+mem: ((2 integer)): 2 <= 3
+run: main 2: (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))
+mem: ((1 integer)) => 1
+mem: ((2 integer)) => 3
+run: main 2: 4 => ((3 integer))
+mem: ((3 integer)): 3 <= 4
+schedule:  done with routine")
+  (s:stream-address <- init-stream x:string-address)
+  (traces:instruction-trace-address-array-address <- parse-traces s:stream-address)
+  (1:terminal-address/raw <- init-fake-terminal 70:literal 15:literal)
+  ; position the cursor away from top of screen
+  (cursor-down 1:terminal-address/raw)
+  (cursor-down 1:terminal-address/raw)
+  (browser-state:space-address <- browser-state traces:instruction-trace-address-array-address 30:literal/screen-height)
+  (print-traces-collapsed browser-state:space-address 1:terminal-address/raw traces:instruction-trace-address-array-address)
+  (2:string-address/raw <- get 1:terminal-address/raw/deref data:offset)
+)
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.2 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "+ main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "+ main/ 2 : 4 => ((3 integer))                                        "))
+  (prn "F - print-traces-collapsed works anywhere on the screen"))
+(run-code main2
+  (print-character 1:terminal-address/raw ((#\* literal))))
+(when (~screen-contains memory*.2 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "+ main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "+ main/ 2 : 4 => ((3 integer))                                        "
+            "*                                                                     "))
+  (prn "F - print-traces-collapsed leaves cursor at next line"))
+
+(reset2)
+(new-trace "process-key-move-up-down")
+(run-code main
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (x:string-address <- new
+"schedule: main
+run: main 0: (((1 integer)) <- ((copy)) ((1 literal)))
+run: main 0: 1 => ((1 integer))
+mem: ((1 integer)): 1 <= 1
+run: main 1: (((2 integer)) <- ((copy)) ((3 literal)))
+run: main 1: 3 => ((2 integer))
+mem: ((2 integer)): 2 <= 3
+run: main 2: (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))
+mem: ((1 integer)) => 1
+mem: ((2 integer)) => 3
+run: main 2: 4 => ((3 integer))
+mem: ((3 integer)): 3 <= 4
+schedule:  done with routine")
+  (s:stream-address <- init-stream x:string-address)
+  (1:instruction-trace-address-array-address/raw <- parse-traces s:stream-address)
+  (2:terminal-address/raw <- init-fake-terminal 70:literal 15:literal)
+  ; position the cursor away from top of screen
+  (cursor-down 2:terminal-address/raw)
+  (cursor-down 2:terminal-address/raw)
+  (3:space-address/raw <- browser-state 1:instruction-trace-address-array-address/raw 30:literal/screen-height)
+  ; draw trace
+  (print-traces-collapsed 3:space-address/raw/browser-state 2:terminal-address/raw 1:instruction-trace-address-array-address/raw)
+  ; move cursor up
+  ; we have no way yet to test special keys like up-arrow
+  (s:string-address <- new "k")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  ; draw cursor
+  (replace-character 2:terminal-address/raw ((#\* literal)))
+  (4:string-address/raw <- get 2:terminal-address/raw/deref data:offset)
+)
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "+ main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "* main/ 2 : 4 => ((3 integer))                                        "))
+            ;^cursor
+  (prn "F - process-key can move up the cursor"))
+(run-code main2
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  ; reset previous cursor
+  (replace-character 2:terminal-address/raw ((#\+ literal)))
+  ; move cursor up 3 more lines
+  (s:string-address <- new "kkk")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (replace-character 2:terminal-address/raw ((#\* literal)))
+  )
+; cursor is now at line 3
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "* main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            ;^cursor
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "+ main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "+ main/ 2 : 4 => ((3 integer))                                        "))
+  (prn "F - process-key can move up multiple times"))
+; try to move cursor up thrice more
+(run-code main3
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (replace-character 2:terminal-address/raw ((#\+ literal)))
+  (s:string-address <- new "kkk")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (replace-character 2:terminal-address/raw ((#\* literal)))
+  )
+; cursor doesn't go beyond the first line printed
+; stuff on screen before browser-state was initialized is inviolate
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "* main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            ;^cursor
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "+ main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "+ main/ 2 : 4 => ((3 integer))                                        "))
+  (prn "F - process-key doesn't move above bounds"))
+; now move cursor down 4 times
+(run-code main4
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (replace-character 2:terminal-address/raw ((#\+ literal)))
+  (s:string-address <- new "jjjj")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (replace-character 2:terminal-address/raw ((#\* literal)))
+  )
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "* main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            ;^cursor
+            "+ main/ 2 : 4 => ((3 integer))                                        "))
+  (prn "F - process-key can move down multiple times"))
+; try to move cursor down 4 more times
+(run-code main5
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (replace-character 2:terminal-address/raw ((#\+ literal)))
+  (s:string-address <- new "jjjj")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (replace-character 2:terminal-address/raw ((#\* literal)))
+  )
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "+ main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "+ main/ 2 : 4 => ((3 integer))                                        "
+            "*                                                                     "))
+  (prn "F - process-key doesn't move below bounds"))
+
+(reset2)
+(new-trace "process-key-expand")
+(run-code main
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (x:string-address <- new
+"schedule: main
+run: main 0: (((1 integer)) <- ((copy)) ((1 literal)))
+run: main 0: 1 => ((1 integer))
+mem: ((1 integer)): 1 <= 1
+run: main 1: (((2 integer)) <- ((copy)) ((3 literal)))
+run: main 1: 3 => ((2 integer))
+mem: ((2 integer)): 2 <= 3
+run: main 2: (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))
+mem: ((1 integer)) => 1
+mem: ((2 integer)) => 3
+run: main 2: 4 => ((3 integer))
+mem: ((3 integer)): 3 <= 4
+schedule:  done with routine")
+  (s:stream-address <- init-stream x:string-address)
+  (1:instruction-trace-address-array-address/raw <- parse-traces s:stream-address)
+  (2:terminal-address/raw <- init-fake-terminal 70:literal 15:literal)
+  ; position the cursor away from top of screen
+  (cursor-down 2:terminal-address/raw)
+  (cursor-down 2:terminal-address/raw)
+  (3:space-address/raw <- browser-state 1:instruction-trace-address-array-address/raw 30:literal/screen-height)
+  ; draw trace
+  (print-traces-collapsed 3:space-address/raw/browser-state 2:terminal-address/raw 1:instruction-trace-address-array-address/raw)
+  (4:string-address/raw <- get 2:terminal-address/raw/deref data:offset)
+)
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "+ main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "+ main/ 2 : 4 => ((3 integer))                                        "))
+  (prn "F - process-key: before expand"))
+(run-code main2
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  ; move cursor to final line and expand
+  (s:string-address <- new "k\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+; final line is expanded
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "+ main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "- main/ 2 : 4 => ((3 integer))                                        "
+            "   mem : ((3 integer)): 3 <= 4                                        "
+            "   schedule :  done with routine                                      "))
+  (prn "F - process-key expands the trace index at cursor on <enter>"))
+; and cursor should remain on the top-level line
+(run-code main3
+  (replace-character 2:terminal-address/raw ((#\* literal)))
+  )
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "+ main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "* main/ 2 : 4 => ((3 integer))                                        "
+            ;^cursor
+            "   mem : ((3 integer)): 3 <= 4                                        "
+            "   schedule :  done with routine                                      "))
+  (prn "F - process-key positions cursor at start of trace index after expanding"))
+
+(reset2)
+(new-trace "process-key-expand-nonlast")
+(run-code main
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (x:string-address <- new
+"schedule: main
+run: main 0: (((1 integer)) <- ((copy)) ((1 literal)))
+run: main 0: 1 => ((1 integer))
+mem: ((1 integer)): 1 <= 1
+run: main 1: (((2 integer)) <- ((copy)) ((3 literal)))
+run: main 1: 3 => ((2 integer))
+mem: ((2 integer)): 2 <= 3
+run: main 2: (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))
+mem: ((1 integer)) => 1
+mem: ((2 integer)) => 3
+run: main 2: 4 => ((3 integer))
+mem: ((3 integer)): 3 <= 4
+schedule:  done with routine")
+  (s:stream-address <- init-stream x:string-address)
+  (1:instruction-trace-address-array-address/raw <- parse-traces s:stream-address)
+  (2:terminal-address/raw <- init-fake-terminal 70:literal 15:literal)
+  ; position the cursor away from top of screen
+  (cursor-down 2:terminal-address/raw)
+  (cursor-down 2:terminal-address/raw)
+  (3:space-address/raw <- browser-state 1:instruction-trace-address-array-address/raw 30:literal/screen-height)
+  ; draw trace
+  (print-traces-collapsed 3:space-address/raw/browser-state 2:terminal-address/raw 1:instruction-trace-address-array-address/raw)
+  ; expand penultimate line
+  (s:string-address <- new "kk\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (4:string-address/raw <- get 2:terminal-address/raw/deref data:offset)
+)
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "- main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "   mem : ((1 integer)) => 1                                           "
+            "   mem : ((2 integer)) => 3                                           "
+            "+ main/ 2 : 4 => ((3 integer))                                        "))
+  (prn "F - process-key: expanding a line continues to print lines after it"))
+
+(reset2)
+(new-trace "process-key-expanded")
+(run-code main
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (x:string-address <- new
+"schedule: main
+run: main 0: (((1 integer)) <- ((copy)) ((1 literal)))
+run: main 0: 1 => ((1 integer))
+mem: ((1 integer)): 1 <= 1
+mem: ((1 integer)): 1 <= 1
+run: main 1: (((2 integer)) <- ((copy)) ((3 literal)))
+run: main 1: 3 => ((2 integer))
+mem: ((2 integer)): 2 <= 3
+run: main 2: (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))
+mem: ((1 integer)) => 1
+mem: ((2 integer)) => 3
+run: main 2: 4 => ((3 integer))
+mem: ((3 integer)): 3 <= 4
+schedule:  done with routine")
+  (s:stream-address <- init-stream x:string-address)
+  (1:instruction-trace-address-array-address/raw <- parse-traces s:stream-address)
+  (2:terminal-address/raw <- init-fake-terminal 70:literal 15:literal)
+  ; position the cursor away from top of screen
+  (cursor-down 2:terminal-address/raw)
+  (cursor-down 2:terminal-address/raw)
+  (3:space-address/raw <- browser-state 1:instruction-trace-address-array-address/raw 30:literal/screen-height)
+  ; draw trace
+  (print-traces-collapsed 3:space-address/raw/browser-state 2:terminal-address/raw 1:instruction-trace-address-array-address/raw)
+  ; expand penultimate line, then move one line down and draw cursor
+  (s:string-address <- new "kk\nj")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (replace-character 2:terminal-address/raw ((#\* literal)))
+  (4:string-address/raw <- get 2:terminal-address/raw/deref data:offset)
+)
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; cursor should be at next top-level 'run' line
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "- main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "   mem : ((1 integer)) => 1                                           "
+            "   mem : ((2 integer)) => 3                                           "
+            "* main/ 2 : 4 => ((3 integer))                                        "))
+  (prn "F - process-key: navigation moves between top-level trace indices only"))
+(run-code main2
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  ; reset previous cursor
+  (replace-character 2:terminal-address/raw ((#\+ literal)))
+  ; move cursor back up one line
+  (s:string-address <- new "k")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  ; show cursor
+  (replace-character 2:terminal-address/raw ((#\* literal)))
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; cursor should be back at the top of the expanded line
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "* main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "   mem : ((1 integer)) => 1                                           "
+            "   mem : ((2 integer)) => 3                                           "
+            "+ main/ 2 : 4 => ((3 integer))                                        "))
+  (prn "F - process-key: navigation moves between top-level indices only - 2"))
+(run-code main3
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  ; reset previous cursor
+  (replace-character 2:terminal-address/raw ((#\+ literal)))
+  ; press enter
+  (s:string-address <- new "\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; expanded trace should now be collapsed
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "+ main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "+ main/ 2 : 4 => ((3 integer))                                        "
+            "                                                                      "
+            "                                                                      "))
+  (prn "F - process-key: process-key collapses trace indices correctly after moving around"))
+(run-code main4
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  ; move up a few lines, expand, then move down and expand again
+  (s:string-address <- new "kkk\njjj\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+;?   (replace-character 2:terminal-address/raw ((#\* literal))) ;? 1
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; first expand should have no effect
+(when (~screen-contains memory*.4 70
+         (+ "                                                                      "
+            "                                                                      "
+            "+ main/ 0 : (((1 integer)) <- ((copy)) ((1 literal)))                 "
+            "+ main/ 0 : 1 => ((1 integer))                                        "
+            "+ main/ 1 : (((2 integer)) <- ((copy)) ((3 literal)))                 "
+            "+ main/ 1 : 3 => ((2 integer))                                        "
+            "- main/ 2 : (((3 integer)) <- ((add)) ((1 integer)) ((2 integer)))    "
+            "   mem : ((1 integer)) => 1                                           "
+            "   mem : ((2 integer)) => 3                                           "
+            "+ main/ 2 : 4 => ((3 integer))                                        "))
+  (prn "F - process-key: process-key collapses the previously expanded trace index when expanding elsewhere"))
+
+;; manage screen height
+
+(reset2)
+(new-trace "trace-paginate")
+(run-code main
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (x:string-address <- new
+"run: main 0: a b c
+mem: 0 a
+run: main 1: d e f
+mem: 1 a
+mem: 1 b
+mem: 1 c
+mem: 1 d
+mem: 1 e
+run: main 2: g hi
+run: main 3: j
+mem: 3 a
+run: main 4: k
+run: main 5: l
+run: main 6: m
+run: main 7: n")
+  (s:stream-address <- init-stream x:string-address)
+  (traces:instruction-trace-address-array-address <- parse-traces s:stream-address)
+  (2:terminal-address/raw <- init-fake-terminal 17:literal 15:literal)
+  (3:space-address/raw/browser-state <- browser-state traces:instruction-trace-address-array-address 3:literal/screen-height)
+  (print-traces-collapsed 3:space-address/raw/browser-state 2:terminal-address/raw)
+  (4:string-address/raw <- get 2:terminal-address/raw/deref data:offset)
+)
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; screen shows a subset of collapsed trace lines
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 0 : a b c"
+            "+ main/ 1 : d e f"
+            "+ main/ 2 : g hi "))
+  (prn "F - print-traces-collapsed can show just one 'page' of a larger trace"))
+
+; expand top line
+(run-code main2
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (s:string-address <- new "kkk\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; screen shows just first trace line fully expanded
+(when (~screen-contains memory*.4 17
+         (+ "- main/ 0 : a b c"
+            "   mem : 0 a     "
+            "+ main/ 1 : d e f"
+            "                 "))
+  (prn "F - expanding doesn't print past end of page"))
+(run-code main2-2
+  (replace-character 2:terminal-address/raw ((#\* literal)))
+  )
+; screen shows part of the second trace line expanded
+(when (~screen-contains memory*.4 17
+         (+ "* main/ 0 : a b c"
+            "   mem : 0 a     "
+            "+ main/ 1 : d e f"
+            "                 "))
+  (prn "F - cursor at right place after expand"))
+
+; expand line below without first collapsing previously expanded line
+(run-code main3
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  ; reset previous cursor
+  (replace-character 2:terminal-address/raw ((#\- literal)))
+  (s:string-address <- new "j\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; screen shows part of the second trace line expanded
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 0 : a b c"
+            "- main/ 1 : d e f"
+            "   mem : 1 a     "
+            "                 "
+            "                 "))
+  (prn "F - expanding below expanded line respects screen/page height"))
+(run-code main3-2
+  (replace-character 2:terminal-address/raw ((#\* literal)))
+  )
+; screen shows part of the second trace line expanded
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 0 : a b c"
+            "* main/ 1 : d e f"
+            "   mem : 1 a     "
+            "                 "
+            "                 "))
+  (prn "F - cursor at right place after expand below"))
+
+; expand line *above* without first collapsing previously expanded line
+(run-code main4
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  ; reset previous cursor
+  (replace-character 2:terminal-address/raw ((#\- literal)))
+  (s:string-address <- new "k\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; screen again shows first trace line expanded
+(when (~screen-contains memory*.4 17
+         (+ "- main/ 0 : a b c"
+            "   mem : 0 a     "
+            "+ main/ 1 : d e f"
+            "                 "))
+  (prn "F - expanding above expanded line respects screen/page height"))
+;? (quit) ;? 1
+
+; collapse everything and hit page-down
+; again, we can't yet check for special keys like 'page-down so we'll use
+; upper-case J and K for moving a page down or up, respectively.
+(run-code main5
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (s:string-address <- new "\nJ")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; screen shows second page of traces
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 3 : j    "
+            "+ main/ 4 : k    "
+            "+ main/ 5 : l    "
+            "                 "))
+  (prn "F - 'page-down' skips to next page after this one"))
+;? (quit) ;? 1
+
+; move cursor down, then page-down
+(run-code main6
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (s:string-address <- new "jJ")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; page-down behaves the same regardless of where the cursor was
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 6 : m    "
+            "+ main/ 7 : n    "
+            "                 "))
+  (prn "F - 'page-down' skips to same place regardless of cursor position"))
+
+; try to page-down past end of trace
+(run-code main7
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (s:string-address <- new "J")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; no change
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 6 : m    "
+            "+ main/ 7 : n    "
+            "                 "))
+  (prn "F - 'page-down' skips to same place regardless of cursor position"))
+
+; now page-up
+(run-code main8
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; precisely undoes previous page-down
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 3 : j    "
+            "+ main/ 4 : k    "
+            "+ main/ 5 : l    "
+            "                 "))
+  (prn "F - 'page-up' on partial page behaves as if page was full"))
+
+;; back to page 1, expand a line
+(run-code main9
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (s:string-address <- new "Kkk\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+;?   (print-character 2:terminal-address/raw ((#\* literal))) ;? 1
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; now we have an expanded line
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 0 : a b c"
+            "- main/ 1 : d e f"
+            "   mem : 1 a     "
+            "                 "
+            "                 "))
+  (prn "F - intermediate state after expanding a line"))
+
+; next page
+(run-code main10
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (s:string-address <- new "J")
+  (k:keyboard-address <- init-keyboard s:string-address)
+;?   ($start-tracing) ;? 1
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; no lines skipped, page with just inner traces
+(when (~screen-contains memory*.4 17
+         (+ "   mem : 1 b     "
+            "   mem : 1 c     "
+            "   mem : 1 d     "
+            "                 "
+            "                 "))
+  (prn "F - page down continues existing expanded line"))
+
+; next page
+(run-code main11
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (s:string-address <- new "J")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+; page with partial inner trace and more collapsed
+(when (~screen-contains memory*.4 17
+         (+ "   mem : 1 e     "
+            "+ main/ 2 : g hi "
+            "+ main/ 3 : j    "
+            "                 "
+            "                 "))
+  (prn "F - page down shows collapsed lines after continued expanded line at top of page"))
+;? (quit) ;? 1
+
+; page-up through an expanded line
+(run-code main12
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "   mem : 1 b     "
+            "   mem : 1 c     "
+            "   mem : 1 d     "
+            "                 "
+            "                 "))
+  (prn "F - page up understands expanded lines"))
+
+;; page up scenarios
+; skip ones starting at top of trace for now
+; page-up scenario 2
+; + run: main 0: a b c
+;   mem: 0 a
+; + run: main 1: d e f  <- top of page
+;   mem: 1 a
+;   mem: 1 b
+;   mem: 1 c
+;   mem: 1 d
+;   mem: 1 e
+; + run: main 2: g hi
+; + run: main 3: j      <- bottom of page
+;   mem: 3 a
+; + run: main 4: k
+; + run: main 5: l
+; + run: main 6: m
+; + run: main 7: n
+(run-code main13
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+;?   ($print first-index-on-page:integer/space:1) ;? 1
+;?   ($print (("\n" literal))) ;? 1
+  (first-index-on-page:integer/space:1 <- copy 1:literal)
+;?   ($print first-index-on-page:integer/space:1) ;? 1
+;?   ($print (("\n" literal))) ;? 1
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 3:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (expanded-index:integer/space:1 <- copy -1:literal)
+  (expanded-children:integer/space:1 <- copy -1:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 0 : a b c"
+            "+ main/ 1 : d e f"
+            "+ main/ 2 : g hi "))
+  (prn "F - page-up 2"))
+
+; page-up scenario 3
+; + run: main 0: a b c
+;   mem: 0 a
+; - run: main 1: d e f  <- top of page
+;   mem: 1 a
+;   mem: 1 b            <- bottom of page
+;   mem: 1 c
+;   mem: 1 d
+;   mem: 1 e
+; + run: main 2: g hi
+; + run: main 3: j
+;   mem: 3 a
+; + run: main 4: k
+; + run: main 5: l
+; + run: main 6: m
+; + run: main 7: n
+(run-code main14pre
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 1:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -1:literal)
+  (last-index-on-page:integer/space:1 <- copy 1:literal)
+  (last-subindex-on-page:integer/space:1 <- copy 1:literal)
+  (expanded-index:integer/space:1 <- copy 1:literal)
+  (expanded-children:integer/space:1 <- copy 5:literal)
+  (to-top 0:space-address/browser-state 2:terminal-address/raw)
+  (print-page 0:space-address/browser-state 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "- main/ 1 : d e f"
+            "   mem : 1 a     "
+            "   mem : 1 b     "
+            "                 "
+            "                 "))
+  (prn "F - page-up 3: initial print-page state"))
+(run-code main14post
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 0:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 1:literal)
+  (last-subindex-on-page:integer/space:1 <- copy 0:literal)
+  (expanded-index:integer/space:1 <- copy 1:literal)
+  (expanded-children:integer/space:1 <- copy 5:literal)
+  (to-top 0:space-address/browser-state 2:terminal-address/raw)
+  (print-page 0:space-address/browser-state 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 0 : a b c"
+            "- main/ 1 : d e f"
+            "   mem : 1 a     "
+            "                 "
+            "                 "))
+  (prn "F - page-up 3: expected post page-up state"))
+;? (quit) ;? 1
+(run-code main14
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 1:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -1:literal)
+  (last-index-on-page:integer/space:1 <- copy 1:literal)
+  (last-subindex-on-page:integer/space:1 <- copy 1:literal)
+  (expanded-index:integer/space:1 <- copy 1:literal)
+  (expanded-children:integer/space:1 <- copy 5:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+;?   ($start-tracing) ;? 1
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 0 : a b c"
+            "- main/ 1 : d e f"
+            "   mem : 1 a     "
+            "                 "
+            "                 "))
+  (prn "F - page-up 3"))
+;? (quit) ;? 1
+
+; page-up scenario 4
+; + run: main 0: a b c
+;   mem: 0 a
+; - run: main 1: d e f
+;   mem: 1 a
+;   mem: 1 b
+;   mem: 1 c            <- top of page
+;   mem: 1 d
+;   mem: 1 e            <- bottom of page
+; + run: main 2: g hi
+; + run: main 3: j
+;   mem: 3 a
+; + run: main 4: k
+; + run: main 5: l
+; + run: main 6: m
+; + run: main 7: n
+(run-code main15
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 1:literal)
+  (first-subindex-on-page:integer/space:1 <- copy 2:literal)
+  (last-index-on-page:integer/space:1 <- copy 1:literal)
+  (last-subindex-on-page:integer/space:1 <- copy 4:literal)
+  (expanded-index:integer/space:1 <- copy 1:literal)
+  (expanded-children:integer/space:1 <- copy 5:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "- main/ 1 : d e f"
+            "   mem : 1 a     "
+            "   mem : 1 b     "
+            "                 "
+            "                 "))
+  (prn "F - page-up 4"))
+
+; page-up scenario 5
+; + run: main 0: a b c
+;   mem: 0 a
+; - run: main 1: d e f
+;   mem: 1 a            <- top of page
+;   mem: 1 b
+;   mem: 1 c            <- bottom of page
+;   mem: 1 d
+;   mem: 1 e
+; + run: main 2: g hi
+; + run: main 3: j
+;   mem: 3 a
+; + run: main 4: k
+; + run: main 5: l
+; + run: main 6: m
+; + run: main 7: n
+(run-code main16pre
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 1:literal)
+  (first-subindex-on-page:integer/space:1 <- copy 0:literal)
+  (last-index-on-page:integer/space:1 <- copy 1:literal)
+  (last-subindex-on-page:integer/space:1 <- copy 2:literal)
+  (expanded-index:integer/space:1 <- copy 1:literal)
+  (expanded-children:integer/space:1 <- copy 5:literal)
+;?   ($print cursor-row:integer/space:1) ;? 1
+  (to-top 0:space-address/browser-state 2:terminal-address/raw)
+;?   ($print cursor-row:integer/space:1) ;? 1
+  (print-page 0:space-address/browser-state 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "   mem : 1 a     "
+            "   mem : 1 b     "
+            "   mem : 1 c     "
+            "                 "
+            "                 "))
+  (prn "F - page-up 5: initial print-page state"))
+(run-code main16
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 1:literal)
+  (first-subindex-on-page:integer/space:1 <- copy 0:literal)
+  (last-index-on-page:integer/space:1 <- copy 1:literal)
+  (last-subindex-on-page:integer/space:1 <- copy 2:literal)
+  (expanded-index:integer/space:1 <- copy 1:literal)
+  (expanded-children:integer/space:1 <- copy 5:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+;?   ($dump-browser-state 3:space-address/raw/browser-state) ;? 1
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 0 : a b c"
+            "- main/ 1 : d e f"
+            "   mem : 1 a     "
+            "                 "
+            "                 "))
+  (prn "F - page-up 5"))
+
+; page-up scenario 6
+; + run: main 0: a b c
+;   mem: 0 a
+; - run: main 1: d e f
+;   mem: 1 a
+;   mem: 1 b            <- top of page
+;   mem: 1 c
+;   mem: 1 d            <- bottom of page
+;   mem: 1 e
+; + run: main 2: g hi
+; + run: main 3: j
+;   mem: 3 a
+; + run: main 4: k
+; + run: main 5: l
+; + run: main 6: m
+; + run: main 7: n
+(run-code main17
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 1:literal)
+  (first-subindex-on-page:integer/space:1 <- copy 1:literal)
+  (last-index-on-page:integer/space:1 <- copy 1:literal)
+  (last-subindex-on-page:integer/space:1 <- copy 3:literal)
+  (expanded-index:integer/space:1 <- copy 1:literal)
+  (expanded-children:integer/space:1 <- copy 5:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 0 : a b c"
+            "- main/ 1 : d e f"
+            "   mem : 1 a     "
+            "                 "
+            "                 "))
+  (prn "F - page-up 6"))
+
+; page-up scenario 7
+; + run: main 0: a b c
+;   mem: 0 a
+; + run: main 1: d e f  <- top of page
+;   mem: 1 a
+;   mem: 1 b
+;   mem: 1 c
+;   mem: 1 d
+;   mem: 1 e
+; + run: main 2: g hi
+; - run: main 3: j      <- bottom of page
+;   mem: 3 a
+; + run: main 4: k
+; + run: main 5: l
+; + run: main 6: m
+; + run: main 7: n
+(run-code main18
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 1:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 3:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -1:literal)
+  (expanded-index:integer/space:1 <- copy 3:literal)
+  (expanded-children:integer/space:1 <- copy 1:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 0 : a b c"
+            "+ main/ 1 : d e f"
+            "+ main/ 2 : g hi "
+            "                 "))
+  (prn "F - page-up 7 - expanded index starts below bottom"))
+;? (quit) ;? 1
+
+; page-up scenario 8
+; + run: main 0: a b c
+;   mem: 0 a
+; + run: main 1: d e f  <- top of page
+;   mem: 1 a
+;   mem: 1 b
+;   mem: 1 c
+;   mem: 1 d
+;   mem: 1 e
+; + run: main 2: g hi
+; + run: main 3: j      <- bottom of page
+;   mem: 3 a
+; - run: main 4: k
+; + run: main 5: l
+; + run: main 6: m
+; + run: main 7: n
+(run-code main19
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 1:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 3:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -1:literal)
+  (expanded-index:integer/space:1 <- copy 4:literal)
+  (expanded-children:integer/space:1 <- copy 0:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 0 : a b c"
+            "+ main/ 1 : d e f"
+            "+ main/ 2 : g hi "
+            "                 "))
+  (prn "F - page-up 8 - expanded index starts below top - 2"))
+
+; page-up scenario 9
+; - run: main 0: a b c
+;   mem: 0 a
+; + run: main 1: d e f
+;   mem: 1 a
+;   mem: 1 b
+;   mem: 1 c
+;   mem: 1 d
+;   mem: 1 e
+; + run: main 2: g hi
+; + run: main 3: j      <- top of page
+;   mem: 3 a
+; + run: main 4: k
+; + run: main 5: l      <- bottom of page
+; + run: main 6: m
+; + run: main 7: n
+(run-code main20
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 3:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 5:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (expanded-index:integer/space:1 <- copy 0:literal)
+  (expanded-children:integer/space:1 <- copy 1:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "   mem : 0 a     "
+            "+ main/ 1 : d e f"
+            "+ main/ 2 : g hi "
+            "                 "))
+  (prn "F - page-up 9 - expanded index overlaps target page"))
+
+; page-up scenario 10
+; - run: main 0: a b c
+;   mem: 0 a
+; + run: main 1: d e f
+;   mem: 1 a
+;   mem: 1 b
+;   mem: 1 c
+;   mem: 1 d
+;   mem: 1 e
+; + run: main 2: g hi   <- top of page
+; + run: main 3: j
+;   mem: 3 a
+; + run: main 4: k      <- bottom of page
+; + run: main 5: l
+; + run: main 6: m
+; + run: main 7: n
+(run-code main21pre
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 2:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 4:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (expanded-index:integer/space:1 <- copy 0:literal)
+  (expanded-children:integer/space:1 <- copy 1:literal)
+  (to-top 0:space-address/browser-state 2:terminal-address/raw)
+;?   ($start-tracing) ;? 2
+  (print-page 0:space-address/browser-state 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 2 : g hi "
+            "+ main/ 3 : j    "
+            "+ main/ 4 : k    "
+            "                 "
+            "                 "))
+  (prn "F - page-up 10: initial print-page state"))
+;? (quit) ;? 1
+(run-code main21
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 2:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 4:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (expanded-index:integer/space:1 <- copy 0:literal)
+  (expanded-children:integer/space:1 <- copy 1:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "- main/ 0 : a b c"
+            "   mem : 0 a     "
+            "+ main/ 1 : d e f"
+            "                 "
+            "                 "))
+  (prn "F - page-up 10 - expanded index overlaps target page - 2"))
+;? (quit) ;? 2
+
+(reset2)
+(new-trace "trace-paginate2")
+; page-up scenario 11
+; + run: main 0: a b c
+;   mem: 0 a
+; + run: main 1: d e f
+; - run: main 2: g hi
+;   mem: 2 a
+; + run: main 3: j      <- top of page
+;   mem: 3 a
+; + run: main 4: k
+; + run: main 5: l      <- bottom of page
+; + run: main 6: m
+; + run: main 7: n
+(run-code main22
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (x:string-address <- new
+"run: main 0: a b c
+mem: 0 a
+run: main 1: d e f
+run: main 2: g hi
+mem: 2 a
+run: main 3: j
+mem: 3 a
+run: main 4: k
+run: main 5: l
+run: main 6: m
+run: main 7: n")
+  (s:stream-address <- init-stream x:string-address)
+  (traces:instruction-trace-address-array-address <- parse-traces s:stream-address)
+  (2:terminal-address/raw <- init-fake-terminal 17:literal 15:literal)
+  (3:space-address/raw/browser-state <- browser-state traces:instruction-trace-address-array-address 3:literal/screen-height)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (4:string-address/raw <- get 2:terminal-address/raw/deref data:offset)
+  (first-index-on-page:integer/space:1 <- copy 3:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 5:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (expanded-index:integer/space:1 <- copy 2:literal)
+  (expanded-children:integer/space:1 <- copy 1:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 1 : d e f"
+            "- main/ 2 : g hi "
+            "   mem : 2 a     "
+            "                 "
+            "                 "))
+  (prn "F - page-up 11 - expanded index overlaps target page - 3"))
+
+; page-up scenario 12
+; + run: main 0: a b c
+;   mem: 0 a
+; + run: main 1: d e f
+; - run: main 2: g hi
+;   mem: 2 a
+; + run: main 3: j
+;   mem: 3 a
+; + run: main 4: k      <- top of page
+; + run: main 5: l
+; + run: main 6: m      <- bottom of page
+; + run: main 7: n
+(run-code main23
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 4:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 6:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (expanded-index:integer/space:1 <- copy 2:literal)
+  (expanded-children:integer/space:1 <- copy 1:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "- main/ 2 : g hi "
+            "   mem : 2 a     "
+            "+ main/ 3 : j    "
+            "                 "))
+  (prn "F - page-up 12 - expanded index overlaps target page - 4"))
+
+; page-up scenario 13
+; + run: main 0: a b c
+;   mem: 0 a
+; + run: main 1: d e f
+; - run: main 2: g hi
+;   mem: 2 a
+; + run: main 3: j
+;   mem: 3 a
+; + run: main 4: k
+; + run: main 5: l
+; + run: main 6: m      <- top of page
+; + run: main 7: n      <- bottom of page
+(run-code main24
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 6:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 7:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (expanded-index:integer/space:1 <- copy 2:literal)
+  (expanded-children:integer/space:1 <- copy 1:literal)
+  (s:string-address <- new "K")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 3 : j    "
+            "+ main/ 4 : k    "
+            "+ main/ 5 : l    "
+            "                 "))
+  (prn "F - page-up 13 - expanded index far above target page"))
+
+(run-code main25
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (s:string-address <- new "kk\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 3 : j    "
+            "- main/ 4 : k    "
+            "+ main/ 5 : l    "
+            "                 "))
+  (prn "F - process-key expands a trace index on any page"))
+(run-code main26
+  (replace-character 2:terminal-address/raw ((#\* literal)))
+)
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 3 : j    "
+            "* main/ 4 : k    "
+            "+ main/ 5 : l    "
+            "                 "))
+  (prn "F - process-key resets the cursor after expand"))
+;? (quit) ;? 1
+
+(run-code main27
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  ; reset previous cursor
+  (replace-character 2:terminal-address/raw ((#\- literal)))
+  (s:string-address <- new "j\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 3 : j    "
+            "+ main/ 4 : k    "
+            "- main/ 5 : l    "
+            "                 "))
+  (prn "F - process-key expands a trace index on any page when there's an expanded trace index above it on the same page"))
+
+; expand scenario
+; + run: main 0: a b c
+;   mem: 0 a
+; + run: main 1: d e f
+; - run: main 2: g hi
+;   mem: 2 a              <- top of page
+; + run: main 3: j
+;   mem: 3 a
+; + run: main 4: k        <- bottom of page
+; + run: main 5: l
+; + run: main 6: m
+; + run: main 7: n
+(run-code main28
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 2:literal)
+  (first-subindex-on-page:integer/space:1 <- copy 0:literal)
+  (last-index-on-page:integer/space:1 <- copy 4:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (expanded-index:integer/space:1 <- copy 2:literal)
+  (expanded-children:integer/space:1 <- copy 1:literal)
+  (to-top 0:space-address/browser-state 2:terminal-address/raw)
+  (print-page 0:space-address/browser-state 2:terminal-address/raw)
+  (s:string-address <- new "kk\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+;?   (replace-character 2:terminal-address/raw ((#\* literal))) ;? 2
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+;?          (+ "   mem : 2 a     "  ; after print-page
+;?             "+ main/ 3 : j    "
+;?             "+ main/ 4 : k    "
+;?             "                 "))
+         (+ "+ main/ 2 : g hi "
+            "- main/ 3 : j    "
+            "   mem : 3 a     "
+            "                 "))
+;?          (+ "- main/ 3 : j    "  ; alternative interpretation in case the above isn't intuitive
+;?             "   mem : 3 a     "
+;?          (+ "- main/ 4 : k    "
+;?             "                 "))
+  (prn "F - process-key expands trace index on a page that starts with a partial expanded trace"))
+
+(reset2)
+(new-trace "trace-paginate3")
+; expand scenario
+; + run: main 0: a b c
+;   mem: 0 a
+; + run: main 1: d e f
+;   mem: 1 a
+;   mem: 1 b              <- top of page
+;   mem: 1 c
+; + run: main 2: g hi     <- bottom of page
+;   mem: 2 a
+; + run: main 3: j
+; + run: main 4: k
+; + run: main 5: l
+(run-code main29
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (x:string-address <- new
+"run: main 0: a b c
+mem: 0 a
+run: main 1: d e f
+mem: 1 a
+mem: 1 b
+mem: 1 c
+run: main 2: g hi
+mem: 2 a
+run: main 3: j
+run: main 4: k
+run: main 5: l")
+  (s:stream-address <- init-stream x:string-address)
+  (traces:instruction-trace-address-array-address <- parse-traces s:stream-address)
+  (2:terminal-address/raw <- init-fake-terminal 17:literal 15:literal)
+  (3:space-address/raw/browser-state <- browser-state traces:instruction-trace-address-array-address 3:literal/screen-height)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (4:string-address/raw <- get 2:terminal-address/raw/deref data:offset)
+  (first-index-on-page:integer/space:1 <- copy 1:literal)
+  (first-subindex-on-page:integer/space:1 <- copy 1:literal)
+  (last-index-on-page:integer/space:1 <- copy 3:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (expanded-index:integer/space:1 <- copy 1:literal)
+  (expanded-children:integer/space:1 <- copy 3:literal)
+  (to-top 0:space-address/browser-state 2:terminal-address/raw)
+  (print-page 0:space-address/browser-state 2:terminal-address/raw)
+;?   (replace-character 2:terminal-address/raw ((#\* literal))) ;? 1
+  (s:string-address <- new "k\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+;?          (+ "   mem : 1 b     "  ; after print-page
+;?             "   mem : 1 c     "
+;?             "+ main/ 2 : g hi "
+;?             "*                "
+;?             "                 "))
+         (+ "+ main/ 1 : d e f"
+            "- main/ 2 : g hi "
+            "   mem : 2 a     "
+            "                 "
+            "                 "))
+  (prn "F - process-key expands trace index on a page that starts with a partial expanded trace - 2"))
+
+; expand scenario
+; + run: main 0: a b c
+;   mem: 0 a
+; + run: main 1: d e f
+;   mem: 1 a              <- top of page
+;   mem: 1 b
+;   mem: 1 c              <- bottom of page
+; + run: main 2: g hi
+;   mem: 2 a
+; + run: main 3: j
+; + run: main 4: k
+; + run: main 5: l
+(run-code main30
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  (first-index-on-page:integer/space:1 <- copy 1:literal)
+  (first-subindex-on-page:integer/space:1 <- copy 0:literal)
+  (last-index-on-page:integer/space:1 <- copy 1:literal)
+  (last-subindex-on-page:integer/space:1 <- copy 2:literal)
+  (expanded-index:integer/space:1 <- copy 1:literal)
+  (expanded-children:integer/space:1 <- copy 3:literal)
+  (to-top 0:space-address/browser-state 2:terminal-address/raw)
+  (print-page 0:space-address/browser-state 2:terminal-address/raw)
+  (s:string-address <- new "k\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+;?   (replace-character 2:terminal-address/raw ((#\* literal))) ;? 1
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+;?          (+ "   mem : 1 a     "  ; after print-page
+;?             "   mem : 1 b     "
+;?             "   mem : 1 c     "
+;?             "*                "))
+         (+ "+ main/ 1 : d e f"
+            "+ main/ 2 : g hi "
+            "+ main/ 3 : j    "))
+  (prn "F - process-key expands trace index on a page with only subindex lines"))
+
+(run-code main31
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  ; reinitialize
+  (first-index-on-page:integer/space:1 <- copy 0:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 2:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (expanded-index:integer/space:1 <- copy -1:literal)
+  (expanded-children:integer/space:1 <- copy -1:literal)
+  (to-top 0:space-address/browser-state 2:terminal-address/raw)
+  (print-page 0:space-address/browser-state 2:terminal-address/raw)
+;?   (replace-character 2:terminal-address/raw ((#\* literal))) ;? 1
+  (s:string-address <- new "Jjj\n")
+  (k:keyboard-address <- init-keyboard s:string-address)
+;?   ($print (("test: first subindex " literal))) ;? 1
+;?   ($print first-subindex-on-page:integer/space:1) ;? 1
+;?   ($print (("\n" literal))) ;? 1
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+;?   ($print (("test: first subindex 2 " literal))) ;? 1
+;?   ($print first-subindex-on-page:integer/space:1) ;? 1
+;?   ($print (("\n" literal))) ;? 1
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+;?   ($print (("test: first subindex 3 " literal))) ;? 1
+;?   ($print first-subindex-on-page:integer/space:1) ;? 1
+;?   ($print (("\n" literal))) ;? 1
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+;?   ($print (("test: first subindex 4 " literal))) ;? 1
+;?   ($print first-subindex-on-page:integer/space:1) ;? 1
+;?   ($print (("\n" literal))) ;? 1
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+(when (~screen-contains memory*.4 17
+         (+ "+ main/ 3 : j    "
+            "+ main/ 4 : k    "
+            "- main/ 5 : l    "
+            "                 "
+            "                 "))
+  (prn "F - process-key expands final index of trace at bottom of page"))
+
+(run-code main32
+  (default-space:space-address <- new space:literal 30:literal/capacity)
+  (0:space-address/names:browser-state <- copy 3:space-address/raw/browser-state)
+  ; reinitialize
+  (first-index-on-page:integer/space:1 <- copy 0:literal)
+  (first-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (last-index-on-page:integer/space:1 <- copy 2:literal)
+  (last-subindex-on-page:integer/space:1 <- copy -2:literal)
+  (expanded-index:integer/space:1 <- copy -1:literal)
+  (expanded-children:integer/space:1 <- copy -1:literal)
+  (to-top 0:space-address/browser-state 2:terminal-address/raw)
+  (print-page 0:space-address/browser-state 2:terminal-address/raw)
+;?   (replace-character 2:terminal-address/raw ((#\* literal))) ;? 1
+  (s:string-address <- new "kk\nJjj")
+  (k:keyboard-address <- init-keyboard s:string-address)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (process-key 3:space-address/raw/browser-state k:keyboard-address 2:terminal-address/raw)
+  (5:integer-address/raw <- get-address 2:terminal-address/raw/deref cursor-row:offset)
+  )
+(each routine completed-routines*
+  (awhen rep.routine!error
+    (prn "error - " it)))
+;? (prn (memory* memory*.5)) ;? 1
+(when (~is 3 (memory* memory*.5))
+  (prn "F - key movement stays within screen bounds, even when no next trace on page"))
+
+(reset2)
+;? (print-times) ;? 3