Thin direct calls to IEnumerable.GetEnumerator

Author: manofstick

src/fsharp/FSharp.Core/seqcore.fs

@@ -479,6 +479,9 @@ namespace Microsoft.FSharp.Collections.SeqComposition
                     count <- count + 1
                 count
 
+        interface IEnumerable<'T> with
+            member __.GetEnumerator () = enumerable.GetEnumerator ()
+
     type DelayedEnumerable<'T>(delayed:unit->ISeq<'T>, pipeIdx:PipeIdx) =
         inherit EnumerableBase<'T>()
 
@@ -590,6 +593,9 @@ namespace Microsoft.FSharp.Collections.SeqComposition
         override __.Length () = array.Length
         override __.GetRaw () = upcast array
 
+        interface IEnumerable<'T> with
+            member __.GetEnumerator () = (array:>IEnumerable<'T>).GetEnumerator ()
+
     type SingletonEnumerable<'T>(item:'T) =
         inherit EnumerableBase<'T>()
 

src/fsharp/FSharp.Core/seqcore.fsi

@@ -118,6 +118,7 @@ namespace Microsoft.FSharp.Collections.SeqComposition
     type internal ThinArrayEnumerable<'T> =
         inherit ArrayEnumerable<'T, 'T>
         new : array<'T> -> ThinArrayEnumerable<'T>
+        interface IEnumerable<'T>
 
     type internal VanillaEnumerable<'T,'U> =
         inherit SeqFactoryBase<'T,'U>
@@ -127,6 +128,7 @@ namespace Microsoft.FSharp.Collections.SeqComposition
     type internal ThinEnumerable<'T> =
         inherit VanillaEnumerable<'T,'T>
         new : IEnumerable<'T> -> ThinEnumerable<'T>
+        interface IEnumerable<'T>
 
     type internal UnfoldEnumerable<'T,'U,'GeneratorState> =
         inherit SeqFactoryBase<'T,'U>