use latest Compat

Author: mohamed82008

Project.toml

@@ -4,6 +4,7 @@ version = "0.3.2"
 
 [deps]
 Combinatorics = "861a8166-3701-5b0c-9a16-15d98fcdc6aa"
+Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"
 DiffRules = "b552c78f-8df3-52c6-915a-8e097449b14b"
 Distributions = "31c24e10-a181-5473-b8eb-7969acd0382f"
 FillArrays = "1a297f60-69ca-5386-bcde-b61e274b549b"
@@ -20,6 +21,7 @@ ZygoteRules = "700de1a5-db45-46bc-99cf-38207098b444"
 
 [compat]
 Combinatorics = "0.7"
+Compat = "3.6"
 DiffRules = "0.1, 1.0"
 Distributions = "0.22"
 FillArrays = "0.8"

src/DistributionsAD.jl

@@ -8,7 +8,8 @@ using PDMats,
       Random, 
       Combinatorics,
       SpecialFunctions,
-      StatsFuns
+      StatsFuns,
+      Compat
 
 using Tracker: Tracker, TrackedReal, TrackedVector, TrackedMatrix, TrackedArray,
                 TrackedVecOrMat, track, @grad, data

src/common.jl

@@ -4,8 +4,6 @@ if VERSION < v"1.1"
     eachcol(A::AbstractVecOrMat) = (view(A, :, i) for i in axes(A, 2))
 end
 
-Base.one(::Irrational) = true
-
 function vcatmapreduce(f, args...)
     init = vcat(f(first.(args)...,))
     zipped_args = zip(args...,)

test/test_utils.jl

@@ -1,3 +1,7 @@
+if VERSION < v"1.1"
+    isnothing(x) = x === nothing
+end
+
 struct ADTestFunction
     name::String
     f::Function