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abstract class NoAbstract
abstract class TwoAbstract { def ap(a: Int): Int; def pa(a: Int): Int }
abstract class Base // check that the super class constructor isn't considered.
abstract class NoEmptyConstructor(a: Int) extends Base { def this(a: String) = this(0); def ap(a: Int): Int }
abstract class OneEmptyConstructor() { def this(a: Int) = this(); def ap(a: Int): Int }
abstract class OneEmptySecondaryConstructor(a: Int) { def this() = this(0); def ap(a: Int): Int }
abstract class MultipleConstructorLists()() { def ap(a: Int): Int }
abstract class MultipleMethodLists()() { def ap(a: Int)(): Int }
abstract class ImplicitConstructorParam()(implicit a: String) { def ap(a: Int): Int }
abstract class ImplicitMethodParam() { def ap(a: Int)(implicit b: String): Int }
abstract class PolyClass[T] { def ap(a: T): T }
abstract class PolyMethod { def ap[T](a: T): T }
abstract class OneAbstract { def ap(a: Int): Any }
abstract class DerivedOneAbstract extends OneAbstract
abstract class SelfTp { self: NoAbstract => def ap(a: Int): Any }
abstract class SelfVar { self => def ap(a: Int): Any }
trait T1 { def t(a: Int): Int }; trait U1
object Test {
implicit val s: String = ""
type NonClassTypeRefinement = DerivedOneAbstract with OneAbstract
type NonClassType = DerivedOneAbstract
// errors:
(() => 0) : NoAbstract
((x: Int) => 0): TwoAbstract
((x: Int) => 0): NoEmptyConstructor
((x: Int) => 0): MultipleConstructorLists
((x: Int) => 0): OneEmptySecondaryConstructor // derived class must have an empty *primary* to call.
((x: Int) => 0): MultipleMethodLists
((x: Int) => 0): ImplicitConstructorParam
((x: Int) => 0): ImplicitMethodParam
((x: Int) => 0): PolyMethod
((x: Int) => 0): SelfTp
((x: Int) => 0): T1 with U1
((x: Int) => 0): NonClassTypeRefinement
// allowed:
((x: Int) => 0): OneEmptyConstructor
((x: Int) => 0): DerivedOneAbstract
((x: Int) => 0): NonClassType // we also allow type aliases in instantiation expressions, if they resolve to a class type
((x: Int) => 0): PolyClass[Int]
((x: Int) => 0): SelfVar
}
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