anchor.diff:                  | Choice1Of2 result ->
                       results.[index] <- result
                       index <- index + 1
  -                
               
               // Return the updated state along with the
               // result (or error, if set).
  
positive.code: 
  //
  [<RequireQualifiedAccess; CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
  module internal Either =
      /// The standard F# Array module, lifted into the Either monad.
      [<RequireQualifiedAccess; CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
      module Array =
          //
  
negative.code:             // Preconditions
              checkNonNull "array" array
  
              async {
  
  
  
              raise <| System.NotImplementedException "ExtCore.Control.Collections.Async.Array.map"
              return Array.empty
              }
  
          //
          [<CompiledName("MapIndexed")>]
  