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object Test {
def BrokenMethod(): HasFilter[(Int, String)] = ???
trait HasFilter[B] {
def filter(p: B => Boolean) = ???
}
trait HasWithFilter {
def withFilter = ???
}
object addWithFilter {
trait NoImplicit
implicit def enrich(v: Any)
(implicit F0: NoImplicit): HasWithFilter = ???
}
BrokenMethod().withFilter(_ => true) // okay
BrokenMethod().filter(_ => true) // okay
locally {
import addWithFilter._
BrokenMethod().withFilter((_: (Int, String)) => true) // okay
}
locally {
import addWithFilter._
// adaptToMemberWithArgs sets the type of the tree `x`
// to ErrorType (while in silent mode, so the error is not
// reported. Later, when the fallback from `withFilter`
// to `filter` is attempted, the closure is taken to have
// have the type `<error> => Boolean`, which conforms to
// `(B => Boolean)`. Only later during pickling does the
// defensive check for erroneous types in the tree pick up
// the problem.
BrokenMethod().withFilter(x => true) // erroneous or inaccessible type.
}
}
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