Error

Background

Given a file named “pen.json” with:

{
  "type": "library",
  "dependencies": {}
}

Call an error function

Given a file named “Foo.pen” with:

f = \() error {
  error(none)
}

When I run pen build

Then the exit status should be 0.

Call a source function

Given a file named “Foo.pen” with:

f = \(e error) any {
  source(e)
}

When I run pen build

Then the exit status should be 0.

Use a try operator

Given a file named “Foo.pen” with:

f = \(x number | error) number | error {
  x? + 1
}

When I run pen build

Then the exit status should be 0.

Use a try operator with a union type

Given a file named “Foo.pen” with:

f = \(x number | none | error) number | error {
  if x = x? as number {
    x + 1
  } else if none {
    0
  }
}

When I run pen build

Then the exit status should be 0.