anchor.diff:              // The compiler optimizer is aware of this function (see use of generic_equality_er_inner_vref in opt.fs)
               // and devirtualizes calls to it based on "T".
               let GenericEqualityERIntrinsic (x : 'T) (y : 'T) : bool =
  -                GenericSpecializeEqualsWithRelation<EquivalenceRelation,_>.Func.Invoke (fsEqualityComparerNoHashingER, x, y)
  +                // The "not (not (x))" is to elimate tail calls which are a problem with value types > 64 bits
  +                not (not (GenericSpecializeEqualsWithRelation<EquivalenceRelation,_>.Func.Invoke (fsEqualityComparerNoHashingER, x, y)))
                   
               /// Implements generic equality between two values using "comp" for recursive calls.
               //
  
positive.code:             // The compiler optimizer is aware of this function  (see use of generic_equality_per_inner_vref in opt.fs)
              // and devirtualizes calls to it based on "T".
              let GenericEqualityIntrinsic (x : 'T) (y : 'T) : bool = 
                  GenericSpecializeEqualsWithRelation<PartialEquivalenceRelation,_>.Func.Invoke (fsEqualityComparerNoHashingPER, x, y)
                  
              /// Implements generic equality between two values, with ER semantics for NaN (so equality on two NaN values returns true)
              //
  
negative.code:             // up with differing functionality of generic and non-generic types when the IStructuralEquatable
              // this is doucmented here- https://github.com/Microsoft/visualfsharp/pull/513#issuecomment-117995410
              let GenericEqualityWithComparerIntrinsic (comp : System.Collections.IEqualityComparer) (x : 'T) (y : 'T) : bool =
                  // The "not (not (x))" is to elimate tail calls which are a problem with value types > 64 bits
                  match comp with
                  | c when obj.ReferenceEquals (c, fsEqualityComparerNoHashingER)  -> not (not (GenericEqualityERIntrinsic x y))
                  | c when obj.ReferenceEquals (c, fsEqualityComparerNoHashingPER) -> not (not (GenericEqualityIntrinsic   x y))
                  | c when obj.ReferenceEquals (c, EqualityComparer<'T>.Default)   -> not (not (EqualityComparer<'T>.Default.Equals (x, y)))
                  | _ -> comp.Equals (box x, box y)
  
              /// Implements generic equality between two values, with ER semantics for NaN (so equality on two NaN values returns true)
  