Mark Compat.MathConstants from #401 for future deprecation

README.md

@@ -225,10 +225,6 @@ Currently, the `@compat` macro supports the following syntaxes:
 * `select`* functions (`select`, `select!`, `selectperm`, `selectperm!`) are renamed to
   `partialsort`* (`partialsort`, `partialsort!`, `partialsortperm`, `partialsortperm!`) ([#23051])
 
-* Math constants (`π`, `pi`, `e`, `γ`, `eulergamma`, `catalan`, `φ`, `golden`) are moved to the
-  `MathConstants` module (available as `Compat.MathConstants`).
-  The name exported from `Base` for `e` is changed to `ℯ`. ([#23427])
-
 * `IntSet` is now `BitSet` ([#24282])
 
 * `strwidth` and `charwidth` are now merged into `textwidth` ([#23667]).

src/Compat.jl

@@ -18,24 +18,11 @@ module Sys
     import Base.Sys: which, isexecutable
     BINDIR = Base.Sys.BINDIR
 end
+import Base.MathConstants
 
 
 include("compatmacro.jl")
 
-# 0.7.0-DEV.1592
-@static if !isdefined(Base, :MathConstants)
-    @eval module MathConstants
-    # All other ones are already exported by Base (so should be already in the users namespace)
-    # and will be automatically be in this module.
-    export ℯ
-    const ℯ = e
-    end
-    const ℯ = e
-    export ℯ
-else
-    import Base.MathConstants
-end
-
 # 0.7.0-DEV.1535
 @static if !isdefined(Base, :partialsort)
     const partialsort = select

test/old.jl

@@ -58,6 +58,19 @@ let sep = Compat.Sys.iswindows() ? ';' : ':'
     end
 end
 
+# 0.7
+module TestMathConstants
+using Compat.MathConstants
+end
+for name in [:π, :pi, :ℯ, :e, :γ, :eulergamma, :catalan, :φ, :golden]
+    @test isdefined(TestMathConstants, name) && !Base.isdeprecated(TestMathConstants, name)
+    @test isdefined(Compat.MathConstants, name) && !Base.isdeprecated(Compat.MathConstants, name)
+end
+module TestMathConstants2
+using Compat
+end
+@test isdefined(TestMathConstants2, :ℯ) && !Base.isdeprecated(TestMathConstants, :ℯ)
+
 
 # tests of removed functionality (i.e. justs tests Base)
 

test/runtests.jl

@@ -103,19 +103,6 @@ end
 # 0.7
 @test isa(1:2, AbstractRange)
 
-# 0.7
-module TestMathConstants
-using Compat.MathConstants
-end
-for name in [:π, :pi, :ℯ, :e, :γ, :eulergamma, :catalan, :φ, :golden]
-    @test isdefined(TestMathConstants, name) && !Base.isdeprecated(TestMathConstants, name)
-    @test isdefined(Compat.MathConstants, name) && !Base.isdeprecated(Compat.MathConstants, name)
-end
-module TestMathConstants2
-using Compat
-end
-@test isdefined(TestMathConstants2, :ℯ) && !Base.isdeprecated(TestMathConstants, :ℯ)
-
 # 0.7
 @test partialsort([3,6,30,1,9], 2, rev=true) == 9
 @test partialsort([3,6,30,1,9], 2, by=x->1/x) == 9