Forward over Reverse Example broken on 0.11-dev

[tgymnich]

using Enzyme

function f(x::Array{Float64}, y::Array{Float64})
    y[1] = x[1] * x[1] + x[2] * x[1]
    return nothing
end

y = [0.0]
x = [2.0, 2.0]

dy = [0.0]
dx = [1.0, 0.0]

bx = [0.0, 0.0]
by = [1.0]
dbx = [0.0, 0.0]
dby = [0.0]

Enzyme.autodiff(
    Forward,
    (x,y) -> Enzyme.autodiff_deferred(f, x, y),
    Duplicated(Duplicated(x, bx), Duplicated(dx, dbx)),
    Duplicated(Duplicated(y, by), Duplicated(dy, dby)),
)

ERROR: Return type inferred to be Union{}. Giving up.
Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:35
  [2] #s329#164
    @ ~/Developer/Enzyme.jl/src/compiler.jl:8295 [inlined]
  [3] var"#s329#164"(FA::Any, A::Any, TT::Any, Mode::Any, ModifiedBetween::Any, width::Any, specid::Any, ReturnPrimal::Any, ShadowInit::Any, parent_job::Any, ::Any, #unused#::Type, #unused#::Type, tt::Any, #unused#::Type, #unused#::Type, #unused#::Type, #unused#::Type, #unused#::Type, #unused#::Type, #unused#::Any)
    @ Enzyme.Compiler ./none:0
  [4] (::Core.GeneratedFunctionStub)(::Any, ::Vararg{Any})
    @ Core ./boot.jl:582
  [5] thunk
    @ ~/Developer/Enzyme.jl/src/compiler.jl:8353 [inlined]
  [6] thunk (repeats 2 times)
    @ ~/Developer/Enzyme.jl/src/compiler.jl:8346 [inlined]
  [7] autodiff
    @ ~/Developer/Enzyme.jl/src/Enzyme.jl:309 [inlined]
  [8] autodiff
    @ ~/Developer/Enzyme.jl/src/Enzyme.jl:225 [inlined]
  [9] autodiff(::EnzymeCore.ForwardMode, ::var"#43#44", ::Duplicated{Duplicated{Vector{Float64}}}, ::Duplicated{Duplicated{Vector{Float64}}})
    @ Enzyme ~/Developer/Enzyme.jl/src/Enzyme.jl:211
 [10] top-level scope
    @ ~/Desktop/Debug/src/example.jl:19

[wsmoses]

This is a "not using the deferred ABI on main, correctly issue for the union{}"