16.1.7 The Boolean Operator |

• V is definitely assigned after a | b when true iff at least one of the following is true:
  • V is definitely assigned after b. (Note that if V is definitely assigned after a, it follows that V is definitely assigned after b.)
  • V is definitely assigned after a when true and V is definitely assigned after b when true.
• V is definitely assigned after a | b when false iff V is definitely assigned after a when false or V is definitely assigned after b when false.
• V is definitely assigned before a iff V is definitely assigned before a | b.
• V is definitely assigned before b iff V is definitely assigned after a.