Mark Compat.Markdown from #492 for deprecation

Author: martinholters

README.md

@@ -81,9 +81,6 @@ Currently, the `@compat` macro supports the following syntaxes:
 * `using Compat.UUIDs` is provided on versions older than 0.7, where this library is
   not yet part of the standard library ([#25819]).
 
-* `using Compat.Markdown` is provided on versions older than 0.7, where this library is
-  not yet part of the standard library ([#25738]).
-
 * `using Compat.Statistics` is provided on versions older than 0.7, where this library is
   not yet part of the standard library ([#27834]).
 

src/Compat.jl

@@ -27,16 +27,11 @@ import Printf
 import LinearAlgebra
 import SparseArrays
 import Random
+import Markdown
 
 
 include("compatmacro.jl")
 
-if VERSION < v"0.7.0-DEV.3589"
-    const Markdown = Base.Markdown
-else
-    import Markdown
-end
-
 if VERSION < v"0.7.0-DEV.2609"
     @eval module SuiteSparse
         if Base.USE_GPL_LIBS

test/old.jl

@@ -133,6 +133,10 @@ Random.seed!(rng, 1)
 @test rand(rng) ≈ 0.23603334566204692
 @test 0 < rand(Random.GLOBAL_RNG, Random.RangeGenerator(1:3)) < 4
 
+# 0.7.0-DEV.3589
+import Compat.Markdown
+@test isa(Markdown.parse("foo"), Markdown.MD)
+
 
 # tests of removed functionality (i.e. justs tests Base)
 

test/runtests.jl

@@ -483,10 +483,6 @@ module TestUUIDs
     @test uuid4() isa UUID
 end
 
-# 0.7.0-DEV.3589
-import Compat.Markdown
-@test isa(Markdown.parse("foo"), Markdown.MD)
-
 @test repr("text/plain", "string") == "\"string\"" #25990
 @test showable("text/plain", 3.14159) #26089