Fix vcat method ambiguity issues on Julia 1.8 (#210)

* Fix `vcat` method ambiguity issues on Julia 1.8

* Upper bound DiffTests

Author: devmotion

Project.toml

@@ -1,6 +1,6 @@
 name = "ReverseDiff"
 uuid = "37e2e3b7-166d-5795-8a7a-e32c996b4267"
-version = "1.14.1"
+version = "1.14.2"
 
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
@@ -21,6 +21,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 ChainRulesCore = "1"
 DiffResults = "1"
 DiffRules = "1.4"
+DiffTests = "< 0.1.2"
 ForwardDiff = "0.10"
 FunctionWrappers = "1"
 LogExpFunctions = "0.3"

src/derivatives/arrays.jl

@@ -33,7 +33,7 @@ function combinations(xs, n)
 end
 
 for f in [:hcat, :vcat]
-    for i = 0:2, c = combinations([:AbstractVector, :TrackedVector, :AbstractMatrix, :TrackedMatrix, :Number, :TrackedReal], i)
+    for i = 0:2, c = combinations([:AbstractVector, :Vector, :TrackedVector, :AbstractMatrix, :TrackedMatrix, :Number, :TrackedReal], i)
         cnames = map(_ -> gensym(), c)
         @eval begin
             Base.$f($([:($x::$c) for (x, c) in zip(cnames, c)]...), x::TrackedVector) = track($f, $(cnames...), x)
@@ -46,6 +46,7 @@ for f in [:hcat, :vcat]
             :Number,
             :AbstractVecOrMat,
             :(Union{AbstractVector, Number}),
+            :Vector,
         ]
             @eval begin
                 Base.$f($([:($x::$c) for (x, c) in zip(cnames, c)]...), x::TrackedVector, xs::$T...) = track($f, $(cnames...), x, xs...)