Block syntax

• The header must be delimited by vertical bars, so

  • [:input | local | becomes...
  • [| :input local |

• This removes ambiguity over local names appearing to be messages to the context.

• Periods separate expressions, and empty expressions between or after separators return Nil.

• There's also no implicit “^ self”! The programmer has more explicit control, but also the code is more manifest about return values.

Notes: