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dsl for capturing field name

The field method takes a T => Unit function as parameter. Hence, the lambda _.age, which is equivalent to x => x.age, is typechecked as returning Unit. The compiler warns that you are using a pure expression (x.age) in statement position (expected type Unit), which basically means that the expression is useless, and might as well be removed.

There is a very simple symptomatic solution to your problem: replace m: T => Unit by m: T => Any. Now your expression x.age is not in statement position anymore, and the compiler is happy.

But your code suggests that there is something wrong a little bit deeper, since you obviously don't use the result of m anywhere. Why is m for anyway?

Categories : Scala

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