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-rw-r--r--archive/2.vm/edit/011-errors.mu886
1 files changed, 0 insertions, 886 deletions
diff --git a/archive/2.vm/edit/011-errors.mu b/archive/2.vm/edit/011-errors.mu
deleted file mode 100644
index 47258815..00000000
--- a/archive/2.vm/edit/011-errors.mu
+++ /dev/null
@@ -1,886 +0,0 @@
-## handling malformed programs
-
-container environment [
-  recipe-errors:text
-]
-
-# copy code from recipe editor, persist to disk, load, save any errors
-def! update-recipes env:&:environment, resources:&:resources, screen:&:screen -> errors-found?:bool, env:&:environment, resources:&:resources, screen:&:screen [
-  local-scope
-  load-inputs
-  recipes:&:editor <- get *env, recipes:offset
-  in:text <- editor-contents recipes
-  resources <- dump resources, [lesson/recipes.mu], in
-  recipe-errors:text <- reload in
-  *env <- put *env, recipe-errors:offset, recipe-errors
-  # if recipe editor has errors, stop
-  {
-    break-unless recipe-errors
-    update-status screen, [errors found     ], 1/red
-    errors-found? <- copy true
-    return
-  }
-  errors-found? <- copy false
-]
-
-after <begin-run-sandboxes-on-F4> [
-  old-recipe-errors:text <- get *env, recipe-errors:offset
-]
-before <end-run-sandboxes-on-F4> [
-  # if there were recipe errors before, check if we can clear them
-  {
-    break-unless old-recipe-errors
-    screen <- render-recipes screen, env, render
-  }
-  render-recipe-errors env, screen
-]
-
-before <end-render-recipe-components> [
-  row <- render-recipe-errors env, screen
-]
-
-def render-recipe-errors env:&:environment, screen:&:screen -> row:num, screen:&:screen [
-  local-scope
-  load-inputs
-  recipe-errors:text <- get *env, recipe-errors:offset
-  recipes:&:editor <- get *env, recipes:offset
-  row:num <- get *recipes, bottom:offset
-  row <- add row, 1
-  return-unless recipe-errors
-  left:num <- get *recipes, left:offset
-  right:num <- get *recipes, right:offset
-  row, screen <- render-text screen, recipe-errors, left, right, 1/red, row
-  # draw dotted line after recipes
-  draw-horizontal screen, row, left, right, 9480/horizontal-dotted
-  row <- add row, 1
-  clear-screen-from screen, row, left, left, right
-]
-
-container environment [
-  error-index:num  # index of first sandbox with an error (or -1 if none)
-]
-
-after <programming-environment-initialization> [
-  *result <- put *result, error-index:offset, -1
-]
-
-after <begin-run-sandboxes> [
-  *env <- put *env, error-index:offset, -1
-]
-
-before <end-run-sandboxes> [
-  {
-    error-index:num <- get *env, error-index:offset
-    sandboxes-completed-successfully?:bool <- equal error-index, -1
-    break-if sandboxes-completed-successfully?
-    errors-found? <- copy true
-  }
-]
-
-before <end-run-sandboxes-on-F4> [
-  {
-    break-unless error?
-    recipe-errors:text <- get *env, recipe-errors:offset
-    break-if recipe-errors
-    error-index:num <- get *env, error-index:offset
-    sandboxes-completed-successfully?:bool <- equal error-index, -1
-    break-if sandboxes-completed-successfully?
-    error-index-text:text <- to-text error-index
-    status:text <- interpolate [errors found (_)    ], error-index-text
-    update-status screen, status, 1/red
-  }
-]
-
-container sandbox [
-  errors:text
-]
-
-def! update-sandbox sandbox:&:sandbox, env:&:environment, idx:num -> sandbox:&:sandbox, env:&:environment [
-  local-scope
-  load-inputs
-  data:text <- get *sandbox, data:offset
-  response:text, errors:text, fake-screen:&:screen, trace:text, completed?:bool <- run-sandboxed data
-  *sandbox <- put *sandbox, response:offset, response
-  *sandbox <- put *sandbox, errors:offset, errors
-  *sandbox <- put *sandbox, screen:offset, fake-screen
-  *sandbox <- put *sandbox, trace:offset, trace
-  {
-    break-if errors
-    break-if completed?
-    errors <- new [took too long!
-]
-    *sandbox <- put *sandbox, errors:offset, errors
-  }
-  {
-    break-unless errors
-    error-index:num <- get *env, error-index:offset
-    error-not-set?:bool <- equal error-index, -1
-    break-unless error-not-set?
-    *env <- put *env, error-index:offset, idx
-  }
-]
-
-# make sure we render any trace
-after <render-sandbox-trace-done> [
-  {
-    sandbox-errors:text <- get *sandbox, errors:offset
-    break-unless sandbox-errors
-    *sandbox <- put *sandbox, response-starting-row-on-screen:offset, 0  # no response
-    row, screen <- render-text screen, sandbox-errors, left, right, 1/red, row
-    # don't try to print anything more for this sandbox
-    jump +render-sandbox-end
-  }
-]
-
-scenario run-shows-errors-in-get [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe foo [|
-      |  get 123:num, foo:offset|
-      |]|
-    ]
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [foo]
-  render-all screen, env, render
-  screen-should-contain [
-    .                                                                                 run (F4)           .
-    .recipe foo [                                      ┊foo                                              .
-    .  get 123:num, foo:offset                         ┊─────────────────────────────────────────────────.
-    .]                                                 ┊                                                 .
-    .                                                  ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-  assume-console [
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  screen-should-contain [
-    .  errors found                                                                   run (F4)           .
-    .recipe foo [                                      ┊foo                                              .
-    .  get 123:num, foo:offset                         ┊─────────────────────────────────────────────────.
-    .]                                                 ┊                                                 .
-    .                                                  ┊                                                 .
-    .foo: unknown element 'foo' in container 'number'  ┊                                                 .
-    .foo: first ingredient of 'get' should be a contai↩┊                                                 .
-    .ner, but got '123:num'                            ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-  screen-should-contain-in-color 1/red, [
-    .  errors found                                                                                      .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .foo: unknown element 'foo' in container 'number'                                                    .
-    .foo: first ingredient of 'get' should be a contai                                                   .
-    .ner, but got '123:num'                                                                              .
-    .                                                                                                    .
-  ]
-]
-
-scenario run-shows-errors-without-final-newline-in-recipe-side [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  assume-resources [
-  ]
-  env:&:environment <- new-programming-environment resources, screen
-  render-all screen, env, render
-  assume-console [
-    type [recipe foo x [
-]]
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  screen-should-contain [
-    .  errors found                                                                   run (F4)           .
-    .recipe foo x [                                    ┊                                                 .
-    .]                                                 ┊─────────────────────────────────────────────────.
-    .foo: ingredient 'x' has no type                   ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario run-updates-status-with-first-erroneous-sandbox [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  assume-resources [
-  ]
-  env:&:environment <- new-programming-environment resources, screen, []
-  render-all screen, env, render
-  assume-console [
-    left-click 3, 80
-    # create invalid sandbox 1
-    type [get foo, x:offset]
-    press F4
-    # create invalid sandbox 0
-    type [get foo, x:offset]
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  # status line shows that error is in first sandbox
-  screen-should-contain [
-    .  errors found (0)                                                               run (F4)           .
-  ]
-]
-
-scenario run-updates-status-with-first-erroneous-sandbox-2 [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  assume-resources [
-  ]
-  env:&:environment <- new-programming-environment resources, screen, []
-  render-all screen, env, render
-  assume-console [
-    left-click 3, 80
-    # create invalid sandbox 2
-    type [get foo, x:offset]
-    press F4
-    # create invalid sandbox 1
-    type [get foo, x:offset]
-    press F4
-    # create valid sandbox 0
-    type [add 2, 2]
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  # status line shows that error is in second sandbox
-  screen-should-contain [
-    .  errors found (1)                                                               run (F4)           .
-  ]
-]
-
-scenario run-hides-errors-from-past-sandboxes [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  assume-resources [
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [get foo, x:offset]  # invalid
-  render-all screen, env, render
-  assume-console [
-    press F4  # generate error
-  ]
-  event-loop screen, console, env, resources
-  assume-console [
-    left-click 3, 58
-    press ctrl-k
-    type [add 2, 2]  # valid code
-    press F4  # update sandbox
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  # error should disappear
-  screen-should-contain [
-    .                                                                                 run (F4)           .
-    .                                                  ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊─────────────────────────────────────────────────.
-    .                                                  ┊0   edit       copy       to recipe    delete    .
-    .                                                  ┊add 2, 2                                         .
-    .                                                  ┊4                                                .
-    .                                                  ┊─────────────────────────────────────────────────.
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario run-updates-errors-for-shape-shifting-recipes [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  # define a shape-shifting recipe with an error
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe foo x:_elem -> z:_elem [|
-      |  local-scope|
-      |  load-ingredients|
-      |  y:&:num <- copy null|
-      |  z <- add x, y|
-      |]|
-    ]
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [foo 2]
-  render-all screen, env, render
-  assume-console [
-    press F4
-  ]
-  event-loop screen, console, env, resources
-  screen-should-contain [
-    .  errors found (0)                                                               run (F4)           .
-    .recipe foo x:_elem -> z:_elem [                   ┊                                                 .
-    .  local-scope                                     ┊─────────────────────────────────────────────────.
-    .  load-ingredients                                ┊0   edit       copy       to recipe    delete    .
-    .  y:&:num <- copy null                            ┊foo 2                                            .
-    .  z <- add x, y                                   ┊foo_2: 'add' requires number ingredients, but go↩.
-    .]                                                 ┊t 'y'                                            .
-    .                                                  ┊─────────────────────────────────────────────────.
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-  # now rerun everything
-  assume-console [
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  # error should remain unchanged
-  screen-should-contain [
-    .  errors found (0)                                                               run (F4)           .
-    .recipe foo x:_elem -> z:_elem [                   ┊                                                 .
-    .  local-scope                                     ┊─────────────────────────────────────────────────.
-    .  load-ingredients                                ┊0   edit       copy       to recipe    delete    .
-    .  y:&:num <- copy null                            ┊foo 2                                            .
-    .  z <- add x, y                                   ┊foo_3: 'add' requires number ingredients, but go↩.
-    .]                                                 ┊t 'y'                                            .
-    .                                                  ┊─────────────────────────────────────────────────.
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario run-avoids-spurious-errors-on-reloading-shape-shifting-recipes [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  # overload a well-known shape-shifting recipe
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe length l:&:list:_elem -> n:num [|
-      |]|
-    ]
-  ]
-  # call code that uses other variants of it, but not it itself
-  test-sandbox:text <- new [x:&:list:num <- copy null
-to-text x]
-  env:&:environment <- new-programming-environment resources, screen, test-sandbox
-  render-all screen, env, render
-  # run it once
-  assume-console [
-    press F4
-  ]
-  event-loop screen, console, env, resources
-  # no errors anywhere on screen (can't check anything else, since to-text will return an address)
-  screen-should-contain-in-color 1/red, [
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                <-                                  .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-  ]
-  # rerun everything
-  assume-console [
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  # still no errors
-  screen-should-contain-in-color 1/red, [
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                <-                                  .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-  ]
-]
-
-scenario run-shows-missing-type-errors [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe foo [|
-      |  x <- copy 0|
-      |]|
-    ]
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [foo]
-  render-all screen, env, render
-  assume-console [
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  screen-should-contain [
-    .  errors found                                                                   run (F4)           .
-    .recipe foo [                                      ┊foo                                              .
-    .  x <- copy 0                                     ┊─────────────────────────────────────────────────.
-    .]                                                 ┊                                                 .
-    .                                                  ┊                                                 .
-    .foo: missing type for 'x' in 'x <- copy 0'        ┊                                                 .
-    .foo: can't copy '0' to 'x'; types don't match     ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario run-shows-unbalanced-bracket-errors [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  # recipe is incomplete (unbalanced '[')
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe foo \\\[|
-      |  x <- copy 0|
-    ]
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [foo]
-  render-all screen, env, render
-  assume-console [
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  screen-should-contain [
-    .  errors found                                                                   run (F4)           .
-    .recipe foo \\[                                      ┊foo                                              .
-    .  x <- copy 0                                     ┊─────────────────────────────────────────────────.
-    .                                                  ┊                                                 .
-    .9: unbalanced '\\[' for recipe                      ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario run-shows-get-on-non-container-errors [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe foo [|
-      |  local-scope|
-      |  x:&:point <- new point:type|
-      |  get x:&:point, 1:offset|
-      |]|
-    ]
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [foo]
-  render-all screen, env, render
-  assume-console [
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  screen-should-contain [
-    .  errors found                                                                   run (F4)           .
-    .recipe foo [                                      ┊foo                                              .
-    .  local-scope                                     ┊─────────────────────────────────────────────────.
-    .  x:&:point <- new point:type                     ┊                                                 .
-    .  get x:&:point, 1:offset                         ┊                                                 .
-    .]                                                 ┊                                                 .
-    .                                                  ┊                                                 .
-    .foo: first ingredient of 'get' should be a contai↩┊                                                 .
-    .ner, but got 'x:&:point'                          ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario run-shows-non-literal-get-argument-errors [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe foo [|
-      |  local-scope|
-      |  x:num <- copy 0|
-      |  y:&:point <- new point:type|
-      |  get *y:&:point, x:num|
-      |]|
-    ]
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [foo]
-  render-all screen, env, render
-  assume-console [
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  screen-should-contain [
-    .  errors found                                                                   run (F4)           .
-    .recipe foo [                                      ┊foo                                              .
-    .  local-scope                                     ┊─────────────────────────────────────────────────.
-    .  x:num <- copy 0                                 ┊                                                 .
-    .  y:&:point <- new point:type                     ┊                                                 .
-    .  get *y:&:point, x:num                           ┊                                                 .
-    .]                                                 ┊                                                 .
-    .                                                  ┊                                                 .
-    .foo: second ingredient of 'get' should have type ↩┊                                                 .
-    .'offset', but got 'x:num'                         ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario run-shows-errors-every-time [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  # try to run a file with an error
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe foo [|
-      |  local-scope|
-      |  x:num <- copy y:num|
-      |]|
-    ]
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [foo]
-  render-all screen, env, render
-  assume-console [
-    press F4
-  ]
-  event-loop screen, console, env, resources
-  screen-should-contain [
-    .  errors found                                                                   run (F4)           .
-    .recipe foo [                                      ┊foo                                              .
-    .  local-scope                                     ┊─────────────────────────────────────────────────.
-    .  x:num <- copy y:num                             ┊                                                 .
-    .]                                                 ┊                                                 .
-    .                                                  ┊                                                 .
-    .foo: tried to read ingredient 'y' in 'x:num <- co↩┊                                                 .
-    .py y:num' but it hasn't been written to yet       ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-  # rerun the file, check for the same error
-  assume-console [
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  screen-should-contain [
-    .  errors found                                                                   run (F4)           .
-    .recipe foo [                                      ┊foo                                              .
-    .  local-scope                                     ┊─────────────────────────────────────────────────.
-    .  x:num <- copy y:num                             ┊                                                 .
-    .]                                                 ┊                                                 .
-    .                                                  ┊                                                 .
-    .foo: tried to read ingredient 'y' in 'x:num <- co↩┊                                                 .
-    .py y:num' but it hasn't been written to yet       ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario run-hides-errors [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 15/height
-  # try to run a file with an error
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe foo [|
-      |  local-scope|
-      |  x:num <- copy y:num|
-      |]|
-    ]
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [foo]
-  render-all screen, env, render
-  assume-console [
-    press F4
-  ]
-  event-loop screen, console, env, resources
-  screen-should-contain [
-    .  errors found                                                                   run (F4)           .
-    .recipe foo [                                      ┊foo                                              .
-    .  local-scope                                     ┊─────────────────────────────────────────────────.
-    .  x:num <- copy y:num                             ┊                                                 .
-    .]                                                 ┊                                                 .
-    .                                                  ┊                                                 .
-    .foo: tried to read ingredient 'y' in 'x:num <- co↩┊                                                 .
-    .py y:num' but it hasn't been written to yet       ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-  # fix the error, hit F4
-  assume-console [
-    left-click 3, 16
-    press ctrl-k
-    type [0]
-    press F4
-  ]
-  event-loop screen, console, env, resources
-  # no error anymore
-  screen-should-contain [
-    .                                                                                 run (F4)           .
-    .recipe foo [                                      ┊                                                 .
-    .  local-scope                                     ┊─────────────────────────────────────────────────.
-    .  x:num <- copy 0                                 ┊0   edit       copy       to recipe    delete    .
-    .]                                                 ┊foo                                              .
-    .                                                  ┊─────────────────────────────────────────────────.
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario scrolling-recipe-side-reveals-errors [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 5/height
-  # recipe overflows recipe side
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe foo [|
-      |  a:num <- copy 0|  # padding to overflow recipe side
-      |  b:num <- copy 0|  # padding to overflow recipe side
-      |  get 123:num, foo:offset|  # line containing error
-      |]|
-    ]
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [foo]
-  render-all screen, env, render
-  # hit F4, generating errors, then scroll down
-  assume-console [
-    press F4
-    press page-down
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  # errors should be displayed
-  screen-should-contain [
-    .  errors found                                                                   run (F4)           .
-    .  get 123:num, foo:offset                         ┊foo                                              .
-    .\\]                                                 ┊─────────────────────────────────────────────────.
-    .                                                  ┊                                                 .
-    .foo: unknown element 'foo' in container 'number'  ┊                                                 .
-  ]
-]
-
-scenario run-instruction-and-print-errors [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 10/height
-  assume-resources [
-  ]
-  # sandbox editor contains an illegal instruction
-  env:&:environment <- new-programming-environment resources, screen, [get 1234:num, foo:offset]
-  render-all screen, env, render
-  assume-console [
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  # check that screen prints error message in red
-  screen-should-contain [
-    .  errors found (0)                                                               run (F4)           .
-    .                                                  ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊─────────────────────────────────────────────────.
-    .                                                  ┊0   edit       copy       to recipe    delete    .
-    .                                                  ┊get 1234:num, foo:offset                         .
-    .                                                  ┊unknown element 'foo' in container 'number'      .
-    .                                                  ┊first ingredient of 'get' should be a container,↩.
-    .                                                  ┊ but got '1234:num'                              .
-    .                                                  ┊─────────────────────────────────────────────────.
-    .                                                  ┊                                                 .
-  ]
-  screen-should-contain-in-color 7/white, [
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                   get 1234:num, foo:offset                         .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-  ]
-  screen-should-contain-in-color 1/red, [
-    .  errors found (0)                                                                                  .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                                                                    .
-    .                                                   unknown element 'foo' in container 'number'      .
-    .                                                   first ingredient of 'get' should be a container, .
-    .                                                    but got '1234:num'                              .
-    .                                                                                                    .
-  ]
-  screen-should-contain-in-color 245/grey, [
-    .                                                                                                    .
-    .                                                  ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊─────────────────────────────────────────────────.
-    .                                                  ┊                                                 .
-    .                                                  ┊                                                 .
-    .                                                  ┊                                                 .
-    .                                                  ┊                                                ↩.
-    .                                                  ┊                                                 .
-    .                                                  ┊─────────────────────────────────────────────────.
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario run-instruction-and-print-errors-only-once [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 10/height
-  assume-resources [
-  ]
-  # sandbox editor contains an illegal instruction
-  env:&:environment <- new-programming-environment resources, screen, [get 1234:num, foo:offset]
-  render-all screen, env, render
-  # run the code in the editors multiple times
-  assume-console [
-    press F4
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  # check that screen prints error message just once
-  screen-should-contain [
-    .  errors found (0)                                                               run (F4)           .
-    .                                                  ┊                                                 .
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊─────────────────────────────────────────────────.
-    .                                                  ┊0   edit       copy       to recipe    delete    .
-    .                                                  ┊get 1234:num, foo:offset                         .
-    .                                                  ┊unknown element 'foo' in container 'number'      .
-    .                                                  ┊first ingredient of 'get' should be a container,↩.
-    .                                                  ┊ but got '1234:num'                              .
-    .                                                  ┊─────────────────────────────────────────────────.
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario sandbox-can-handle-infinite-loop [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 20/height
-  # sandbox editor will trigger an infinite loop
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe foo [|
-      |  {|
-      |    loop|
-      |  }|
-      |]|
-    ]
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [foo]
-  render-all screen, env, render
-  # run the sandbox
-  assume-console [
-    press F4
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  screen-should-contain [
-    .  errors found (0)                                                               run (F4)           .
-    .recipe foo [                                      ┊                                                 .
-    .  {                                               ┊─────────────────────────────────────────────────.
-    .    loop                                          ┊0   edit       copy       to recipe    delete    .
-    .  }                                               ┊foo                                              .
-    .]                                                 ┊took too long!                                   .
-    .                                                  ┊─────────────────────────────────────────────────.
-    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-]
-
-scenario sandbox-with-errors-shows-trace [
-  local-scope
-  trace-until 100/app  # trace too long
-  assume-screen 100/width, 10/height
-  # generate a stash and a error
-  assume-resources [
-    [lesson/recipes.mu] <- [
-      |recipe foo [|
-      |  local-scope|
-      |  a:num <- next-ingredient|
-      |  b:num <- next-ingredient|
-      |  stash [dividing by], b|
-      |  _, c:num <- divide-with-remainder a, b|
-      |  reply b|
-      |]|
-    ]
-  ]
-  env:&:environment <- new-programming-environment resources, screen, [foo 4, 0]
-  render-all screen, env, render
-  # run
-  assume-console [
-    press F4
-  ]
-  event-loop screen, console, env, resources
-  # screen prints error message
-  screen-should-contain [
-    .  errors found (0)                                                               run (F4)           .
-    .recipe foo [                                      ┊                                                 .
-    .  local-scope                                     ┊─────────────────────────────────────────────────.
-    .  a:num <- next-ingredient                        ┊0   edit       copy       to recipe    delete    .
-    .  b:num <- next-ingredient                        ┊foo 4, 0                                         .
-    .  stash [dividing by], b                          ┊foo: divide by zero in '_, c:num <- divide-with-↩.
-    .  _, c:num <- divide-with-remainder a, b          ┊remainder a, b'                                  .
-    .  reply b                                         ┊─────────────────────────────────────────────────.
-    .]                                                 ┊                                                 .
-    .                                                  ┊                                                 .
-  ]
-  # click on the call in the sandbox
-  assume-console [
-    left-click 4, 55
-  ]
-  run [
-    event-loop screen, console, env, resources
-  ]
-  # screen should expand trace
-  screen-should-contain [
-    .  errors found (0)                                                               run (F4)           .
-    .recipe foo [                                      ┊                                                 .
-    .  local-scope                                     ┊─────────────────────────────────────────────────.
-    .  a:num <- next-ingredient                        ┊0   edit       copy       to recipe    delete    .
-    .  b:num <- next-ingredient                        ┊foo 4, 0                                         .
-    .  stash [dividing by], b                          ┊dividing by 0                                    .
-    .  _, c:num <- divide-with-remainder a, b          ┊14 instructions run                              .
-    .  reply b                                         ┊foo: divide by zero in '_, c:num <- divide-with-↩.
-    .]                                                 ┊remainder a, b'                                  .
-    .                                                  ┊─────────────────────────────────────────────────.
-  ]
-]