Conditional equality for RoseTree

Author: mausch

src/FSharpx.Collections.Experimental/RoseTree.fs

@@ -8,7 +8,7 @@ open System.Runtime.CompilerServices
 /// Multi-way tree, also known as rose tree.
 // Ported from http://hackage.haskell.org/packages/archive/containers/latest/doc/html/src/Data-Tree.html
 [<CustomEquality; NoComparison>]
-type RoseTree<'T> = 
+type RoseTree<[<EqualityConditionalOn>] 'T> = 
     { Root: 'T; Children: RoseForest<'T> }
 
     override x.Equals y =