isStandaloneExpression
See https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.2
Return
true if the expression is a standalone expression
See https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.2
true if the expression is a standalone expression