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object Test {
abstract class Settings {}
abstract class Grist
{ self =>
type settingsType <: Settings
type moduleType <: Module {type settingsType = self.settingsType}
val module: moduleType
}
abstract class Tool
{ self =>
type settingsType <: Settings
type moduleType = Module { type settingsType = self.settingsType }
type gristType = Grist { type moduleType <: self.moduleType; type settingsType <: self.settingsType }
def inputGrist: List[gristType]
}
abstract class Module
{ self =>
type settingsType <: Settings
final type commonModuleType = Module {type settingsType = self.settingsType}
type selfType >: self.type <: commonModuleType
// BTW: if we use the commented out type decls, the code compiles successfully
// type gristType = Grist {type settingsType <: self.settingsType; type moduleType <: commonModuleType }
val tools: List[Tool {type settingsType = self.settingsType}]
protected def f: List[commonModuleType] =
{
val inputGrists = tools.flatMap(_.inputGrist) // val inputGrists: List[gristType] =
inputGrists.map(_.module)
}
}
}
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