fix weak deps

Author: ChrisRackauckas

Project.toml

@@ -89,10 +89,13 @@ MonteCarloMeasurements = "0987c9cc-fe09-11e8-30f0-b96dd679fdca"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+ReverseDiff = "37e2e3b7-166d-5795-8a7a-e32c996b4267"
 SafeTestsets = "1bc83da4-3b8d-516f-aca4-4fe02f6d838f"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+Tracker = "9f7883ad-71c0-57eb-9f7f-b5c9e6d3789c"
 Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
+Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
 [targets]
 test = ["Distributed", "GeneralizedGenerated", "Measurements", "MonteCarloMeasurements", "Unitful", "LabelledArrays", "ForwardDiff", "InteractiveUtils", "Plots", "Pkg", "Random", "SafeTestsets", "Statistics", "Test", "Distributions"]

ext/DiffEqBaseReverseDiffExt.jl

@@ -1,5 +1,9 @@
 module DiffEqBaseReverseDiffExt
 
+using DiffEqBase
+import DiffEqBase: value
+import ReverseDiff
+
 DiffEqBase.value(x::ReverseDiff.TrackedReal) = x.value
 DiffEqBase.value(x::ReverseDiff.TrackedArray) = x.value
 

ext/DiffEqBaseTrackerExt.jl

@@ -1,16 +1,8 @@
 module DiffEqBaseTrackerExt
 
-function RecursiveArrayTools.recursivecopy!(b::AbstractArray{T, N},
-                                            a::AbstractArray{T2, N}) where {
-                                                                            T <:
-                                                                            Tracker.TrackedArray,
-                                                                            T2 <:
-                                                                            Tracker.TrackedArray,
-                                                                            N}
-    @inbounds for i in eachindex(a)
-        b[i] = copy(a[i])
-    end
-end
+using DiffEqBase
+import DiffEqBase: value
+import Tracker
 
 DiffEqBase.value(x::Type{Tracker.TrackedReal{T}}) where {T} = T
 DiffEqBase.value(x::Type{Tracker.TrackedArray{T, N, A}}) where {T, N, A} = Array{T, N}

ext/DiffEqBaseZygoteExt.jl

@@ -1,5 +1,9 @@
 module DiffEqBaseZygoteExt
 
+using DiffEqBase
+import DiffEqBase: value
+import Zygote
+
 function ∇tmap(cx, f, args...)
     ys_and_backs = SciMLBase.tmap((args...) -> Zygote._pullback(cx, f, args...), args...)
     if isempty(ys_and_backs)