From 02cf36400b847b9a94a8ae2d526842ff42b38abc Mon Sep 17 00:00:00 2001
From: Kristoffer Carlsson <kcarlsson89@gmail.com>
Date: Wed, 17 Mar 2021 18:07:39 +0100
Subject: [PATCH] =?UTF-8?q?Revert=20"add=20'=E1=B5=80=20postfix=20operator?=
 =?UTF-8?q?=20for=20transpose=20(#38062)"=20(#40075)?=
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This reverts commit 665279aedb18501938c934d46aa593a26a506b3e.

(cherry picked from commit 7838e0973ba3183735cca6485a65ae9e708f0c1d)
---
 NEWS.md                              |  1 -
 base/exports.jl                      |  1 -
 base/operators.jl                    |  1 -
 stdlib/LinearAlgebra/src/adjtrans.jl | 12 ------------
 test/operators.jl                    |  3 ---
 5 files changed, 18 deletions(-)

diff --git a/NEWS.md b/NEWS.md
index ad41fb40a1876..0ce4a5cc458d5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -114,7 +114,6 @@ New library features
   inserting or consuming the first dimension depending on the ratio of `sizeof(T)` and `sizeof(S)`.
 * New `append!(vector, collections...)` and `prepend!(vector, collections...)` methods accept multiple
   collections to be appended or prepended ([#36227]).
-* The postfix operator `'ᵀ` can now be used as an alias for `transpose` ([#38062]).
 * `keys(io::IO)` has been added, which returns all keys of `io` if `io` is an `IOContext` and an empty
   `Base.KeySet` otherwise ([#37753]).
 * `count` now accepts an optional `init` argument to control the accumulation type ([#37461]).
diff --git a/base/exports.jl b/base/exports.jl
index 0c157c45d2052..cedf0b1e48be2 100644
--- a/base/exports.jl
+++ b/base/exports.jl
@@ -467,7 +467,6 @@ export
 # linear algebra
     var"'", # to enable syntax a' for adjoint
     adjoint,
-    var"'ᵀ",
     transpose,
     kron,
     kron!,
diff --git a/base/operators.jl b/base/operators.jl
index d591b6254255a..8120e95913e3c 100644
--- a/base/operators.jl
+++ b/base/operators.jl
@@ -567,7 +567,6 @@ end
 function kron! end
 
 const var"'" = adjoint
-const var"'ᵀ" = transpose
 
 """
     \\(x, y)
diff --git a/stdlib/LinearAlgebra/src/adjtrans.jl b/stdlib/LinearAlgebra/src/adjtrans.jl
index c89da6d60141d..5710021f2772b 100644
--- a/stdlib/LinearAlgebra/src/adjtrans.jl
+++ b/stdlib/LinearAlgebra/src/adjtrans.jl
@@ -136,7 +136,6 @@ julia> x'x
 adjoint(A::AbstractVecOrMat) = Adjoint(A)
 
 """
-    A'ᵀ
     transpose(A)
 
 Lazy transpose. Mutating the returned object should appropriately mutate `A`. Often,
@@ -146,9 +145,6 @@ that this operation is recursive.
 This operation is intended for linear algebra usage - for general data manipulation see
 [`permutedims`](@ref Base.permutedims), which is non-recursive.
 
-!!! compat "Julia 1.6"
-    The postfix operator `'ᵀ` requires Julia 1.6.
-
 # Examples
 ```jldoctest
 julia> A = [3+2im 9+2im; 8+7im  4+6im]
@@ -160,14 +156,6 @@ julia> transpose(A)
 2×2 transpose(::Matrix{Complex{Int64}}) with eltype Complex{Int64}:
  3+2im  8+7im
  9+2im  4+6im
-
-julia> x = [3, 4im]
-2-element Vector{Complex{Int64}}:
- 3 + 0im
- 0 + 4im
-
-julia> x'ᵀx
--7 + 0im
 ```
 """
 transpose(A::AbstractVecOrMat) = Transpose(A)
diff --git a/test/operators.jl b/test/operators.jl
index fb884d52cbf98..1abfffaa09744 100644
--- a/test/operators.jl
+++ b/test/operators.jl
@@ -253,7 +253,4 @@ end
     @test ∋(0)(-2:2)
 end
 
-a = rand(3, 3)
-@test transpose(a) === a'ᵀ
-
 @test [Base.afoldl(+, 1:i...) for i = 1:40] == [i * (i + 1) ÷ 2 for i = 1:40]