Panagiotis Vekris e049ec3456 [Flow] Function predicate declaration (#103)
* [Flow] Function predicate declaration

The accepted syntax for function declarations is extended to allow
the following predicate declaration:

  FunctionReturnType :=
    Type
    Predicate
    Type Predicate

  Predicate :=
    %checks
    %checks ( ConditionalExpression )

* [Flow] Minor tweaks and more examples to function predicates

* [Flow] Clean-up and better message for function predicates

* [Flow] Adding abstract function predicate example

* [Flow] Rearranging the `predicate` field to ease babel generator.
2017-02-10 14:55:13 +01:00

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