checker-framework
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Implement `JavaExpression` for a `FunctionalInterfaceNode`
A Java FunctionalInterfaceNode
can be one of:
- Method Reference: https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.13
- Lambda Expression: https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.27