comment and remove 4th method

Author: oscardssmith

src/norecompile.jl

@@ -59,10 +59,10 @@ function wrapfun_iip(ff,
     dualT2 = ArrayInterface.promote_eltype(T2, dualT)
     dualT4 = dualgen(T4)
 
-    iip_arglists = (Tuple{T1, T2, T3, T4},
-        Tuple{dualT1, dualT2, T3, T4},
-        Tuple{dualT1, T2, T3, dualT4},
-        Tuple{dualT1, dualT2, T3, dualT4})
+    iip_arglists = (Tuple{T1, T2, T3, T4}, # primal
+        Tuple{dualT1, dualT2, T3, T4},     # vjp
+        Tuple{dualT1, T2, T3, dualT4},     # tgrad
+        )
 
     iip_returnlists = ntuple(x -> Nothing, 4)