Fixed issue reported: http://stackoverflow.com/questions/2682487/comp…

…ilation-issues-using-scalazs-ma-methods-on-set-but-not-list/2686764#2686764
scalaz · Apr 22, 2010 · 26455f0 · 26455f0
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commit 26455f0
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diff --git a/core/src/main/scala/scalaz/Scalaz.scala b/core/src/main/scala/scalaz/Scalaz.scala
@@ -138,8 +138,11 @@ object Scalaz extends ScalazLow
 
   implicit def MapEntryMA[X, A](e: Entry[X, A]): MA[PartialApply1Of2[Entry, X]#Apply, A] = ma[PartialApply1Of2[Entry, X]#Apply, A](e)
 
-  // Seq[A] implements Function1[Int, A]. Without this, Function1FlipMA would be used.
-  implicit def SeqMA[M[_] <: Seq[_], A](l: M[A]): MA[M, A] = ma[M, A](l)
+  // Seq[A] implements Function1[Int, A]. Without this, Function1ApplyMA would be used.
+  implicit def SeqMA[M[X] <: Seq[X], A](l: M[A]): MA[M, A] = ma[M, A](l)
+
+  // Set[A] implements Function1[Int, B]. Without this, Function1ApplyMA would be used.
+  implicit def SetMA[M[X] <: Set[X], A](s: M[A]): MA[M, A] = ma[M, A](s)
 
   implicit def KleisliMA[M[_], A, B](k: Kleisli[M,A,B]): MA[PartialApplyKA[Kleisli, M, A]#Apply, B] = ma[PartialApplyKA[Kleisli, M, A]#Apply, B](k)
 

diff --git a/example/src/main/scala/scalaz/example/ExampleFold.scala b/example/src/main/scala/scalaz/example/ExampleFold.scala
@@ -36,6 +36,8 @@ object ExampleFold {
     // which lazily handles the infinite Stream.
     (Stream.continually(1) ∃ (_ > 0)) assert_≟ true
 
+    Set(1, 2, 3) ∃ { _ % 2 == 0 } assert_≟ true
+
     // Checking if all elements satisfy a predicate, using Stream FoldRight,
     // which lazily handles the infinite Stream.
     (Stream.continually(1) ∀ (_ == 0)) assert_≟ false