     o "Expression ! OF Expression",             -> new OpNode '!', new ParentheticalNode new OpNode 'in', $1, $4
   ]
 
-}
 
 # Precedence
 # ----------


  # An individual **When** clause, with action.
  When: [
    o "LEADING_WHEN SimpleArgs Block",            -> new IfNode $2, $3, {statement: true}
    o "LEADING_WHEN SimpleArgs Block TERMINATOR", -> new IfNode $2, $3, {statement: true}
  ]

  # The most basic form of *if* is a condition and an action. The following

  # clause. If it's an array comprehension, you can also choose to step through
  # in fixed-size increments.
  ForSource: [
    o "IN Expression",                               -> source: $2
    o "OF Expression",                               -> source: $2, object: true
    o "IN Expression WHEN Expression",               -> source: $2, guard: $4
    o "OF Expression WHEN Expression",               -> source: $2, guard: $4, object: true
    o "IN Expression BY Expression",                 -> source: $2, step:  $4
    o "IN Expression WHEN Expression BY Expression", -> source: $2, guard: $4, step:   $6
    o "IN Expression BY Expression WHEN Expression", -> source: $2, step:  $4, guard: $6
  ]

  # The CoffeeScript switch/when/else block replaces the JavaScript
