More fixups

Author: wsmoses

src/enzyme.jl

@@ -122,7 +122,7 @@ function EnzymeCore.EnzymeRules.reverse(config, func::EnzymeCore.Const{typeof(NN
     end
 
     ddsts = dst.dval
-    dsrcs = src.dval
+    dsrcs = (typeof(src) <: EnzymeCore.Const) ? ddsts : src.dval
 
     if EnzymeCore.EnzymeRules.width(config) == 1
         ddsts = (ddsts,)
@@ -182,7 +182,7 @@ function EnzymeCore.EnzymeRules.reverse(config, func::EnzymeCore.Const{typeof(NN
     end
 
     ddsts = dst.dval
-    dsrcs = src.dval
+    dsrcs = (typeof(src) <: EnzymeCore.Const) ? ddsts : src.dval
 
     if EnzymeCore.EnzymeRules.width(config) == 1
         ddsts = (ddsts,)
@@ -322,12 +322,6 @@ function EnzymeCore.EnzymeRules.augmented_primal(config, func::EnzymeCore.Const{
         keep = nothing
     end
 
-    # Cache idx if its overwritten
-    cache_idx = ( EnzymeCore.EnzymeRules.overwritten(config)[4]
-                    && !(typeof(src) <: EnzymeCore.Const)
-                    && !(typeof(dst) <: EnzymeCore.Const)
-                    ) ? copy(idx.val) : nothing
-
     return EnzymeCore.EnzymeRules.AugmentedReturn(primal, shadow, keep)
 end
 
@@ -336,7 +330,7 @@ function EnzymeCore.EnzymeRules.reverse(config, func::EnzymeCore.Const{typeof(NN
     val = convert(T, 1/(1-p.val))
 
     ddsts = dst.dval
-    dsrcs = src.dval
+    dsrcs = (typeof(src) <: EnzymeCore.Const) ? ddsts : src.dval
 
     if EnzymeCore.EnzymeRules.width(config) == 1
         ddsts = (ddsts,)