From 42851ed2675015d42bb341b82a09bd0bef4a8ce4 Mon Sep 17 00:00:00 2001 From: Samuel Gruetter Date: Tue, 16 Dec 2014 16:38:09 +0100 Subject: move failing tests from tests/untried/pos to tests/pending/pos --- tests/pending/pos/tcpoly_ticket2096.scala | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 tests/pending/pos/tcpoly_ticket2096.scala (limited to 'tests/pending/pos/tcpoly_ticket2096.scala') diff --git a/tests/pending/pos/tcpoly_ticket2096.scala b/tests/pending/pos/tcpoly_ticket2096.scala new file mode 100644 index 000000000..d2387b36b --- /dev/null +++ b/tests/pending/pos/tcpoly_ticket2096.scala @@ -0,0 +1,30 @@ +// smallest expression of monad i can find +trait MBrace[C[X] <: MBrace[C,X],A] { + def nest( a : A ) : C[A] + def flatten[T <: C[C[A]]]( bsq : T ) : C[A] +} + +// a monad that is a Seq +trait MBraceSeq[C[X] <: MBrace[C,X] with Seq[X],A] extends MBrace[C,A] + +// one of the simplest witnesses of monad i can find +case class MSequitor[A]( a_ : A* ) extends Seq[A] with MBrace[MSequitor,A] +{ + override def nest( a : A ) = new MSequitor[A]( a ) + override def flatten[T <: MSequitor[MSequitor[A]]]( bsq : T ) : MSequitor[A] = { + (new MSequitor[A]( ) /: bsq)( { + ( acc : MSequitor[A], e : MSequitor[A] ) => ( acc ++ e ).asInstanceOf[MSequitor[A]] + } ) + } + override def length = a_.length + override def iterator = a_.iterator + override def apply( n : Int ) = a_.apply( n ) +} + +// type arguments [MSequitor,A] do not conform to trait MBraceSeq's type parameter bounds [C[_] <: MBrace[C,A] with Seq[A],A] +// a statement of the instance relation +class MBraceSequitor[A] extends MBraceSeq[MSequitor,A] { + val empty : MSequitor[A] = new MSequitor[A]( ) + override def nest( a : A ) = empty.nest( a ) + override def flatten[T <: MSequitor[MSequitor[A]]]( bsq : T ): MSequitor[A] = empty.flatten( bsq ) +} -- cgit v1.2.3