From b878e54a57ddb51fba7996e81a9fbe1c8a02ece9 Mon Sep 17 00:00:00 2001
From: Simeon David Schaub <schaub@mit.edu>
Date: Thu, 28 Oct 2021 01:57:23 -0400
Subject: [PATCH 1/2] Revert "Merge pull request #495 from JuliaDiff/mz/error"

This reverts commit a724bbb1beb75281bdfe576bde2ff98b1c507013, reversing
changes made to bde316600b2644af05f2ad4d6e81ae47c85151ca.
---
 src/tangent_types/tangent.jl  | 17 -----------------
 test/tangent_types/tangent.jl | 22 +---------------------
 2 files changed, 1 insertion(+), 38 deletions(-)

diff --git a/src/tangent_types/tangent.jl b/src/tangent_types/tangent.jl
index ec7c64448..bb91e431e 100644
--- a/src/tangent_types/tangent.jl
+++ b/src/tangent_types/tangent.jl
@@ -25,18 +25,6 @@ struct Tangent{P,T} <: AbstractTangent
     # Note: If T is a Tuple/Dict, then P is also a Tuple/Dict
     # (but potentially a different one, as it doesn't contain differentials)
     backing::T
-
-    function Tangent{P,T}(backing) where {P,T}
-        if P <: Tuple
-            T <: Tuple || _backing_error(P, T, Tuple)
-        elseif P <: AbstractDict
-            T <: AbstractDict || _backing_error(P, T, AbstractDict)
-        elseif P === Any  # can be anything
-        else  # Any other struct (including NamedTuple)
-            T <: NamedTuple || _backing_error(P, T, NamedTuple)
-        end
-        return new(backing)
-    end
 end
 
 function Tangent{P}(; kwargs...) where {P}
@@ -57,11 +45,6 @@ function Tangent{P}(d::Dict) where {P<:Dict}
     return Tangent{P,typeof(d)}(d)
 end
 
-function _backing_error(P, G, E)
-    msg = "Tangent for the primal $P should be backed by a $E type, not by $G."
-    return throw(ArgumentError(msg))
-end
-
 function Base.:(==)(a::Tangent{P,T}, b::Tangent{P,T}) where {P,T}
     return backing(a) == backing(b)
 end
diff --git a/test/tangent_types/tangent.jl b/test/tangent_types/tangent.jl
index 1e6b27878..9fcb227a1 100644
--- a/test/tangent_types/tangent.jl
+++ b/test/tangent_types/tangent.jl
@@ -23,26 +23,6 @@ end
         @test typeof(Tangent{Tuple{}}()) == Tangent{Tuple{},Tuple{}}
     end
 
-    @testset "constructor" begin
-        t = (1.0, 2.0)
-        nt = (x=1, y=2.0)
-        d = Dict(:x => 1.0, :y => 2.0)
-        vals = [1, 2]
-
-        @test_throws ArgumentError Tangent{typeof(t),typeof(nt)}(nt)
-        @test_throws ArgumentError Tangent{typeof(t),typeof(d)}(d)
-
-        @test_throws ArgumentError Tangent{typeof(d),typeof(nt)}(nt)
-        @test_throws ArgumentError Tangent{typeof(d),typeof(t)}(t)
-
-        @test_throws ArgumentError Tangent{typeof(nt),typeof(vals)}(vals)
-        @test_throws ArgumentError Tangent{typeof(nt),typeof(d)}(d)
-        @test_throws ArgumentError Tangent{typeof(nt),typeof(t)}(t)
-
-        @test_throws ArgumentError Tangent{Foo,typeof(d)}(d)
-        @test_throws ArgumentError Tangent{Foo,typeof(t)}(t)
-    end
-
     @testset "==" begin
         @test Tangent{Foo}(; x=0.1, y=2.5) == Tangent{Foo}(; x=0.1, y=2.5)
         @test Tangent{Foo}(; x=0.1, y=2.5) == Tangent{Foo}(; y=2.5, x=0.1)
@@ -134,7 +114,7 @@ end
         @test_throws MethodError reverse(Tangent{Foo}(; x=1.0, y=2.0))
 
         d = Dict(:x => 1, :y => 2.0)
-        cdict = Tangent{typeof(d),typeof(d)}(d)
+        cdict = Tangent{Foo,typeof(d)}(d)
         @test_throws MethodError reverse(Tangent{Foo}())
     end
 

From 4f7a28939a07a23ec568548c31c2b21a3cb8e4ce Mon Sep 17 00:00:00 2001
From: Simeon David Schaub <schaub@mit.edu>
Date: Thu, 28 Oct 2021 02:02:36 -0400
Subject: [PATCH 2/2] bump version

---
 Project.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Project.toml b/Project.toml
index 4b0a35e4a..c94d6c4dc 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "ChainRulesCore"
 uuid = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
-version = "1.11.0"
+version = "1.11.1"
 
 [deps]
 Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"