Remove compat/ad.jl

Author: penelopeysm

test/Project.toml

@@ -6,7 +6,6 @@ Accessors = "7d9f7c33-5ae7-4f3b-8dc6-eff91059b697"
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 Bijectors = "76274a88-744f-5084-9051-94815aaf08c4"
 Combinatorics = "861a8166-3701-5b0c-9a16-15d98fcdc6aa"
-Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"
 DifferentiationInterface = "a0c0ee7d-e4b9-4e03-894e-1c5f64a51d63"
 Distributed = "8ba89e20-285c-5b6f-9357-94700520ee1b"
 Distributions = "31c24e10-a181-5473-b8eb-7969acd0382f"
@@ -36,7 +35,6 @@ Accessors = "0.1"
 Aqua = "0.8"
 Bijectors = "0.15.1"
 Combinatorics = "1"
-Compat = "4.3.0"
 DifferentiationInterface = "0.6.41, 0.7"
 Distributions = "0.25"
 DistributionsAD = "0.6.3"

test/compat/ad.jl

@@ -15,7 +15,6 @@ using MCMCChains
 using StableRNGs
 using ReverseDiff
 using Zygote
-using Compat
 
 using Distributed
 using LinearAlgebra
@@ -79,9 +78,6 @@ include("test_util.jl")
     end
 
     if GROUP == "All" || GROUP == "Group2"
-        @testset "compat" begin
-            include(joinpath("compat", "ad.jl"))
-        end
         @testset "extensions" begin
             include("ext/DynamicPPLMCMCChainsExt.jl")
             include("ext/DynamicPPLJETExt.jl")

test/runtests.jl

@@ -8,26 +8,6 @@
 end
 const gdemo_default = gdemo_d()
 
-# TODO(penelopeysm): Remove this (and also test/compat/ad.jl)
-function test_model_ad(model, logp_manual)
-    vi = VarInfo(model)
-    x = vi[:]
-
-    # Log probabilities using the model.
-    ℓ = DynamicPPL.LogDensityFunction(model, vi)
-    logp_model = Base.Fix1(LogDensityProblems.logdensity, ℓ)
-
-    # Check that both functions return the same values.
-    lp = logp_manual(x)
-    @test logp_model(x) ≈ lp
-
-    # Gradients based on the manual implementation.
-    grad = ForwardDiff.gradient(logp_manual, x)
-
-    # Gradients based on the model.
-    @test ForwardDiff.gradient(logp_model, x) ≈ grad
-end
-
 """
     short_varinfo_name(vi::AbstractVarInfo)