.

3 files changed, 89 insertions, 67 deletions

diff --git a/shell/infix.mu b/shell/infix.mu
new file mode 100644
index 00000000..0d23b3f4
--- /dev/null
+++ b/shell/infix.mu
@@ -0,0 +1,6 @@
+fn transform-infix _x-ah: (addr handle cell), trace: (addr trace) {
+  trace-text trace, "infix", "transform infix"
+  trace-lower trace
+  trace-text trace, "infix", "todo"
+  trace-higher trace
+}
diff --git a/shell/read.mu b/shell/read.mu
index e5eea010..1066d215 100644
--- a/shell/read.mu
+++ b/shell/read.mu
@@ -19,6 +19,6 @@ fn read-cell in: (addr gap-buffer), out: (addr handle cell), trace: (addr trace)
     break-if-=
     return
   }
-  # TODO: transform infix
   parse-input parenthesized-tokens, out, trace
+  transform-infix out, trace
 }
diff --git a/shell/sandbox.mu b/shell/sandbox.mu
index d4926bff..5115eca2 100644
--- a/shell/sandbox.mu
+++ b/shell/sandbox.mu
@@ -1046,45 +1046,49 @@ fn test-run-preserves-trace-view-on-rerun {
   #
   render-sandbox screen, sandbox, 0/x, 0/y, 0x80/width, 0x10/height, 1/show-cursor
   # skip one line of padding
-  check-screen-row screen,                                  1/y, " 7                     ", "F - test-run-preserves-trace-view-on-rerun/pre0-0"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 1/y, "  |                    ", "F - test-run-preserves-trace-view-on-rerun/pre0-0/cursor"
-  check-screen-row screen,                                  2/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre0-1"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 2/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre0-1/cursor"
-  check-screen-row screen,                                  3/y, " => 7                  ", "F - test-run-preserves-trace-view-on-rerun/pre0-2"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 3/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre0-2/cursor"
+  check-screen-row screen,                                    1/y, " 7                     ", "F - test-run-preserves-trace-view-on-rerun/pre0-0"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   1/y, "  |                    ", "F - test-run-preserves-trace-view-on-rerun/pre0-0/cursor"
+  check-screen-row screen,                                    2/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre0-1"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   2/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre0-1/cursor"
+  check-screen-row screen,                                    3/y, " => 7                  ", "F - test-run-preserves-trace-view-on-rerun/pre0-2"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   3/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre0-2/cursor"
   # move cursor into trace
   edit-sandbox sandbox, 0xd/ctrl-m, 0/no-globals, 0/no-disk
   render-sandbox screen, sandbox, 0/x, 0/y, 0x80/width, 0x10/height, 1/show-cursor
   #
-  check-screen-row screen,                                  1/y, " 7                     ", "F - test-run-preserves-trace-view-on-rerun/pre1-0"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 1/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre1-0/cursor"
-  check-screen-row screen,                                  2/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre1-1"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 2/y, " |||                   ", "F - test-run-preserves-trace-view-on-rerun/pre1-1/cursor"
-  check-screen-row screen,                                  3/y, " => 7                  ", "F - test-run-preserves-trace-view-on-rerun/pre1-2"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 3/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre1-2/cursor"
+  check-screen-row screen,                                    1/y, " 7                     ", "F - test-run-preserves-trace-view-on-rerun/pre1-0"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   1/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre1-0/cursor"
+  check-screen-row screen,                                    2/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre1-1"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   2/y, " |||                   ", "F - test-run-preserves-trace-view-on-rerun/pre1-1/cursor"
+  check-screen-row screen,                                    3/y, " => 7                  ", "F - test-run-preserves-trace-view-on-rerun/pre1-2"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   3/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre1-2/cursor"
   # expand
   edit-sandbox sandbox, 0xa/newline, 0/no-globals, 0/no-disk
   clear-screen screen
   render-sandbox screen, sandbox, 0/x, 0/y, 0x80/width, 0x10/height, 1/show-cursor
   #
-  check-screen-row screen,                                  1/y, " 7                     ", "F - test-run-preserves-trace-view-on-rerun/pre2-0"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 1/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-0/cursor"
-  check-screen-row screen,                                  2/y, " 1 tokenize            ", "F - test-run-preserves-trace-view-on-rerun/pre2-1"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 2/y, " ||||||||||            ", "F - test-run-preserves-trace-view-on-rerun/pre2-1/cursor"
-  check-screen-row screen,                                  3/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre2-2"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 3/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-2/cursor"
-  check-screen-row screen,                                  4/y, " 1 insert parens       ", "F - test-run-preserves-trace-view-on-rerun/pre2-3"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 4/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-3/cursor"
-  check-screen-row screen,                                  5/y, " 1 parse               ", "F - test-run-preserves-trace-view-on-rerun/pre2-4"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 5/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-4/cursor"
-  check-screen-row screen,                                  6/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre2-5"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 6/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-5/cursor"
-  check-screen-row screen,                                  7/y, " 1 macroexpand 7       ", "F - test-run-preserves-trace-view-on-rerun/pre2-6"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 7/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-6/cursor"
-  check-screen-row screen,                                  8/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre2-7"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 8/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-7/cursor"
-  check-screen-row screen,                                  9/y, " 1 => 7                ", "F - test-run-preserves-trace-view-on-rerun/pre2-8"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 9/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-8/cursor"
+  check-screen-row screen,                                    1/y, " 7                     ", "F - test-run-preserves-trace-view-on-rerun/pre2-0"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   1/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-0/cursor"
+  check-screen-row screen,                                    2/y, " 1 tokenize            ", "F - test-run-preserves-trace-view-on-rerun/pre2-1"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   2/y, " ||||||||||            ", "F - test-run-preserves-trace-view-on-rerun/pre2-1/cursor"
+  check-screen-row screen,                                    3/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre2-2"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   3/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-2/cursor"
+  check-screen-row screen,                                    4/y, " 1 insert parens       ", "F - test-run-preserves-trace-view-on-rerun/pre2-3"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   4/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-3/cursor"
+  check-screen-row screen,                                    5/y, " 1 parse               ", "F - test-run-preserves-trace-view-on-rerun/pre2-4"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   5/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-4/cursor"
+  check-screen-row screen,                                    6/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre2-5"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   6/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-5/cursor"
+  check-screen-row screen,                                    7/y, " 1 transform infix     ", "F - test-run-preserves-trace-view-on-rerun/pre2-6"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   7/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-6/cursor"
+  check-screen-row screen,                                    8/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre2-7"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   8/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-7/cursor"
+  check-screen-row screen,                                    9/y, " 1 macroexpand 7       ", "F - test-run-preserves-trace-view-on-rerun/pre2-8"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   9/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-8/cursor"
+  check-screen-row screen,                                  0xa/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre2-9"
+  check-background-color-in-screen-row screen, 7/bg=cursor, 0xa/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-9/cursor"
+  check-screen-row screen,                                  0xb/y, " 1 => 7                ", "F - test-run-preserves-trace-view-on-rerun/pre2-10"
+  check-background-color-in-screen-row screen, 7/bg=cursor, 0xb/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre2-10/cursor"
   # move cursor down below the macroexpand line and expand
   edit-sandbox sandbox, 0x6a/j, 0/no-globals, 0/no-disk
   render-sandbox screen, sandbox, 0/x, 0/y, 0x80/width, 0x10/height, 1/show-cursor
@@ -1098,46 +1102,58 @@ fn test-run-preserves-trace-view-on-rerun {
   render-sandbox screen, sandbox, 0/x, 0/y, 0x80/width, 0x10/height, 1/show-cursor
   edit-sandbox sandbox, 0x6a/j, 0/no-globals, 0/no-disk
   render-sandbox screen, sandbox, 0/x, 0/y, 0x80/width, 0x10/height, 1/show-cursor
+  edit-sandbox sandbox, 0x6a/j, 0/no-globals, 0/no-disk
+  render-sandbox screen, sandbox, 0/x, 0/y, 0x80/width, 0x10/height, 1/show-cursor
+  edit-sandbox sandbox, 0x6a/j, 0/no-globals, 0/no-disk
+  render-sandbox screen, sandbox, 0/x, 0/y, 0x80/width, 0x10/height, 1/show-cursor
   #
-  check-screen-row screen,                                  1/y, " 7                     ", "F - test-run-preserves-trace-view-on-rerun/pre3-0"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 1/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-0/cursor"
-  check-screen-row screen,                                  2/y, " 1 tokenize            ", "F - test-run-preserves-trace-view-on-rerun/pre3-1"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 2/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-1/cursor"
-  check-screen-row screen,                                  3/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre3-2"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 3/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-2/cursor"
-  check-screen-row screen,                                  4/y, " 1 insert parens       ", "F - test-run-preserves-trace-view-on-rerun/pre3-3"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 4/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-3/cursor"
-  check-screen-row screen,                                  5/y, " 1 parse               ", "F - test-run-preserves-trace-view-on-rerun/pre3-4"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 5/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-4/cursor"
-  check-screen-row screen,                                  6/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre3-5"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 6/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-5/cursor"
-  check-screen-row screen,                                  7/y, " 1 macroexpand 7       ", "F - test-run-preserves-trace-view-on-rerun/pre3-6"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 7/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-6/cursor"
-  check-screen-row screen,                                  8/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre3-7"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 8/y, " |||                   ", "F - test-run-preserves-trace-view-on-rerun/pre3-7/cursor"
-  check-screen-row screen,                                  9/y, " 1 => 7                ", "F - test-run-preserves-trace-view-on-rerun/pre3-8"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 9/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-8/cursor"
+  check-screen-row screen,                                    1/y, " 7                     ", "F - test-run-preserves-trace-view-on-rerun/pre3-0"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   1/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-0/cursor"
+  check-screen-row screen,                                    2/y, " 1 tokenize            ", "F - test-run-preserves-trace-view-on-rerun/pre3-1"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   2/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-1/cursor"
+  check-screen-row screen,                                    3/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre3-2"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   3/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-2/cursor"
+  check-screen-row screen,                                    4/y, " 1 insert parens       ", "F - test-run-preserves-trace-view-on-rerun/pre3-3"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   4/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-3/cursor"
+  check-screen-row screen,                                    5/y, " 1 parse               ", "F - test-run-preserves-trace-view-on-rerun/pre3-4"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   5/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-4/cursor"
+  check-screen-row screen,                                    6/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre3-5"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   6/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-5/cursor"
+  check-screen-row screen,                                    7/y, " 1 transform infix     ", "F - test-run-preserves-trace-view-on-rerun/pre3-6"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   7/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-6/cursor"
+  check-screen-row screen,                                    8/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre3-7"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   8/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-7/cursor"
+  check-screen-row screen,                                    9/y, " 1 macroexpand 7       ", "F - test-run-preserves-trace-view-on-rerun/pre3-8"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   9/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-8/cursor"
+  check-screen-row screen,                                  0xa/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/pre3-9"
+  check-background-color-in-screen-row screen, 7/bg=cursor, 0xa/y, " |||                   ", "F - test-run-preserves-trace-view-on-rerun/pre3-9/cursor"
+  check-screen-row screen,                                  0xb/y, " 1 => 7                ", "F - test-run-preserves-trace-view-on-rerun/pre3-10"
+  check-background-color-in-screen-row screen, 7/bg=cursor, 0xb/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/pre3-10/cursor"
   # expand
   edit-sandbox sandbox, 0xa/newline, 0/no-globals, 0/no-disk
   clear-screen screen
   render-sandbox screen, sandbox, 0/x, 0/y, 0x80/width, 0x10/height, 1/show-cursor
   # cursor line is expanded
-  check-screen-row screen,                                  1/y, " 7                     ", "F - test-run-preserves-trace-view-on-rerun/expand-0"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 1/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-0/cursor"
-  check-screen-row screen,                                  2/y, " 1 tokenize            ", "F - test-run-preserves-trace-view-on-rerun/expand-1"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 2/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-1/cursor"
-  check-screen-row screen,                                  3/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/expand-2"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 3/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-2/cursor"
-  check-screen-row screen,                                  4/y, " 1 insert parens       ", "F - test-run-preserves-trace-view-on-rerun/expand-3"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 4/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-3/cursor"
-  check-screen-row screen,                                  5/y, " 1 parse               ", "F - test-run-preserves-trace-view-on-rerun/expand-4"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 5/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-4/cursor"
-  check-screen-row screen,                                  6/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/expand-5"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 6/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-5/cursor"
-  check-screen-row screen,                                  7/y, " 1 macroexpand 7       ", "F - test-run-preserves-trace-view-on-rerun/expand-6"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 7/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-6/cursor"
-  check-screen-row screen,                                  8/y, " 2 macroexpand-iter 7  ", "F - test-run-preserves-trace-view-on-rerun/expand-7"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 8/y, " ||||||||||||||||||||  ", "F - test-run-preserves-trace-view-on-rerun/expand-7/cursor"
-  check-screen-row screen,                                  9/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/expand-8"
-  check-background-color-in-screen-row screen, 7/bg=cursor, 9/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-8/cursor"
+  check-screen-row screen,                                    1/y, " 7                     ", "F - test-run-preserves-trace-view-on-rerun/expand-0"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   1/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-0/cursor"
+  check-screen-row screen,                                    2/y, " 1 tokenize            ", "F - test-run-preserves-trace-view-on-rerun/expand-1"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   2/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-1/cursor"
+  check-screen-row screen,                                    3/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/expand-2"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   3/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-2/cursor"
+  check-screen-row screen,                                    4/y, " 1 insert parens       ", "F - test-run-preserves-trace-view-on-rerun/expand-3"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   4/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-3/cursor"
+  check-screen-row screen,                                    5/y, " 1 parse               ", "F - test-run-preserves-trace-view-on-rerun/expand-4"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   5/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-4/cursor"
+  check-screen-row screen,                                    6/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/expand-5"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   6/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-5/cursor"
+  check-screen-row screen,                                    7/y, " 1 transform infix     ", "F - test-run-preserves-trace-view-on-rerun/expand-6"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   7/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-6/cursor"
+  check-screen-row screen,                                    8/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/expand-7"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   8/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-7/cursor"
+  check-screen-row screen,                                    9/y, " 1 macroexpand 7       ", "F - test-run-preserves-trace-view-on-rerun/expand-8"
+  check-background-color-in-screen-row screen, 7/bg=cursor,   9/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-8/cursor"
+  check-screen-row screen,                                  0xa/y, " 2 macroexpand-iter 7  ", "F - test-run-preserves-trace-view-on-rerun/expand-9"
+  check-background-color-in-screen-row screen, 7/bg=cursor, 0xa/y, " ||||||||||||||||||||  ", "F - test-run-preserves-trace-view-on-rerun/expand-9/cursor"
+  check-screen-row screen,                                  0xb/y, " ...                   ", "F - test-run-preserves-trace-view-on-rerun/expand-10"
+  check-background-color-in-screen-row screen, 7/bg=cursor, 0xb/y, "                       ", "F - test-run-preserves-trace-view-on-rerun/expand-10/cursor"
 }