Revert "-BindReturn"

This reverts commit 78d8835.

Author: wallymathieu

src/FSharpPlus/Builders.fs

@@ -45,6 +45,7 @@ module GenericBuilders =
         member inline __.Yield  (x: 'T) = result x                                       : '``Monad<'T>``
         member inline __.Bind (p: '``Monad<'T>``, rest: 'T->'``Monad<'U>``) = p >>= rest : '``Monad<'U>``
         member inline __.MergeSources (t1: '``Monad<'T>``, t2: '``Monad<'U>``)           : '``Monad<'T * 'U>`` = Lift2.Invoke tuple2 t1 t2
+        member inline __.BindReturn   (x : '``Monad<'T>``, f: 'T -> 'U)                  : '``Monad<'U>``      = Map.Invoke f x
 
         [<CustomOperation("select", MaintainsVariableSpaceUsingBind=true, AllowIntoPattern=true)>]
         member inline __.Select (x, [<ProjectionParameter>] f) = map f x

tests/FSharpPlus.Tests/General.fs

@@ -1819,7 +1819,7 @@ module MonadTransformers =
         let _ = put initialState : ChoiceT<State<int, Choice<unit,string>>>
 
         ()
-
+#if APPLICATIVE_FIX
     [<Test>]
     let testStateT () =
         let lst1: StateT<string,_> = StateT.lift [1;2]
@@ -1854,6 +1854,7 @@ module MonadTransformers =
         areEqual (Ok 11) x
         let y = (fn |> ResultT.run |> Reader.run) -1
         areEqual (Error NegativeValue) y
+#endif
 
 module ProfunctorDefaults =
     type Fun<'T,'U> = Fun of ('T -> 'U) with

tests/FSharpPlusFable.Tests/FSharpTests/General.fs

@@ -122,7 +122,7 @@ let monadTransformers = testList "MonadTransformers" [
         let _ = put initialState : ChoiceT<State<int, Choice<unit,string>>>
 
         ())
-    #if !NETSTANDARD3_0
+    #if APPLICATIVE_FIX
     testCase "testStateT" (fun () ->
         let lst1: StateT<string,_> = StateT.lift [1;2]
         let lst2: StateT<string,_> = StateT.lift [4;5]