EXCLUDE_ENCLOSED_EXPR
A Function that returns its argument (an Expression) when the argument is not an EnclosedExpr, otherwise the first Expression down the argument's 'inner' path that is not an EnclosedExpr.
A Function that returns its argument (an Expression) when the argument is not an EnclosedExpr, otherwise the first Expression down the argument's 'inner' path that is not an EnclosedExpr.