Fix array of tuple any (#1685)

* Fix array of tuple any

* Update typetree.jl

* Update typetree.jl

Author: wsmoses

src/typetree.jl

@@ -161,7 +161,7 @@ end
         offset = 0
 
         tt = copy(typetree(T, ctx, dl, seen))
-        if !allocatedinline(T)
+        if !allocatedinline(T) && Base.isconcretetype(T)
             merge!(tt, TypeTree(API.DT_Pointer, ctx))
             only!(tt, 0)
         end
@@ -184,7 +184,7 @@ else
     function typetree_inner(::Type{<:GenericMemory{kind, T}}, ctx, dl, seen::TypeTreeTable) where {kind, T}
         offset = 0
         tt = copy(typetree(T, ctx, dl, seen))
-        if !allocatedinline(T)
+        if !allocatedinline(T) && Base.isconcretetype(T)
             merge!(tt, TypeTree(API.DT_Pointer, ctx))
             only!(tt, 0)
         end

test/runtests.jl

@@ -3236,6 +3236,23 @@ end
     @test ad_eta[1] ≈ 0.0
 end
 
+function absset(out, x)
+    @inbounds out[1] = (x,)
+    return nothing
+end
+
+@testset "Abstract Array element type" begin
+    out = Tuple{Any}[(9.7,)]
+    dout = Tuple{Any}[(4.3,)]
+
+    autodiff(Enzyme.Forward,
+                      absset,
+                      Duplicated(out, dout),
+                      Duplicated(3.1, 2.4)
+                      )
+    @test dout[1][1] ≈ 2.4
+end
+
 @testset "Tape Width" begin
     struct Roo
         x::Float64