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object Test {
trait Engine1
implicit class EngineTools1[Params, R](e: Engine1) {
def asRequirement: Requirement1[Params, R] = ???
}
trait Requirement1[Params, R] {
def pathsIncludingSelf: Traversable[List[Reportable1[Params, R]]]
}
trait Reportable1[Params, R]
// "missing parameter type" error was swallowed in 2.11.0 leading to a crash
// in the backend.
//
// This error is itself a regression (or at least a change) in 2.11.0-M7,
// specifically in SI-7944. The type parameters to the implicit view
// `EngineTools1` are undetermined, and are now treated as type variables
// in the expected type of the closure argument to `withFilter`.
for (path: List[Any] <- (null : Engine1).asRequirement.pathsIncludingSelf.toList) {
???
}
}
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