scala - Is there a way to ensure a type is Serializable at compile time -

i work spark often, , save me lot of time if compiler ensure type serializable.

perhaps type class?

def foo[t: isserializable](t: t) = {   // stuff requiring t serializable } 

it's not enough constrain t <: serializable. still fail @ runtime. unit tests substitute, can still forget them, when working big teams.

i think impossible @ compile time without types being sealed.

yes, possible, not in way you're hoping. type class isserializable provide mechanism convert t value of type is guaranteed serializable , again,

trait isserializable[t] {   def toserializable(t: t): string   def fromserializable(s: string): option[t] } 

but, of course, alternative type class based serialization mechanism in it's own right, making use of jvm serialization redundant.

your best course of action lobby spark support type class based serialization directly.