update global configuration, removing enable_tangent_transform

Author: oxinabox

src/ChainRulesTestUtils.jl

@@ -9,10 +9,6 @@ using LinearAlgebra
 using Random
 using Test
 
-const _fdm = central_fdm(5, 1; max_range=1e-2)
-const TEST_INFERRED = Ref(true)
-const TRANSFORMS_TO_ALT_TANGENTS = Function[x -> @thunk(x)] # e.g. [x -> @thunk(x), _ -> ZeroTangent(), x -> rebasis(x)]
-
 export TestIterator
 export test_approx, test_scalar, test_frule, test_rrule, generate_well_conditioned_matrix
 export ⊢, rand_tangent

src/global_config.jl

@@ -1,28 +1,6 @@
 const _fdm = central_fdm(5, 1; max_range=1e-2)
 const TEST_INFERRED = Ref(true)
-const TRANSFORMS_TO_ALT_TANGENTS = Function[] # e.g. [x -> @thunk(x), _ -> ZeroTangent(), x -> rebasis(x)]
-
-"""
-    enable_tangent_transform!(Thunk)
-
-Adds a alt-tangent tranform to the list of default `tangent_transforms` for
-[`test_frule`](@ref) and [`test_rrule`](@ref) to test.
-This list of defaults is overwritten by the `tangent_transforms` keyword argument.
-
-!!! info "Transitional Feature"
-    ChainRulesCore v1.0 will require that all well-behaved rules work for a variety of
-    tangent representations. In turn, the corresponding release of ChainRulesTestUtils will 
-    test all the different tangent representations by default.
-    At that stage `enable_tangent_transform!(Thunk)` will have no effect, as it will already 
-    be enabled.
-    We provide this configuration as a transitional feature to help migrate your packages
-    one feature at a time, prior to the breaking release of ChainRulesTestUtils that will
-    enforce it.  
-"""
-function enable_tangent_transform!(::Type{Thunk})
-    push!(TRANSFORMS_TO_ALT_TANGENTS, x->@thunk(x))
-    unique!(TRANSFORMS_TO_ALT_TANGENTS)
-end
+const TRANSFORMS_TO_ALT_TANGENTS = Function[x->@thunk(x)] # e.g. [_ -> ZeroTangent(), x -> rebasis(x)]
 
 "sets up TEST_INFERRED based ion enviroment variables"
 function init_test_inferred_setting!()