Remove definition of Compat.isapprox

Was added in #309.

README.md

@@ -134,8 +134,6 @@ Currently, the `@compat` macro supports the following syntaxes:
 * `transcode` converts between UTF-xx string encodings in Julia 0.5 (as a lightweight
    alternative to the LegacyStrings package) ([#17323])
 
-* `Compat.isapprox` with `nans` keyword argument ([#20022])
-
 * `Compat.readline` with `keep` keyword argument ([#25646])
 
 * `Compat.eachline` with `keep` keyword argument ([#25646])
@@ -483,7 +481,6 @@ includes this fix. Find the minimum version from there.
 [#19635]: https://github.com/JuliaLang/julia/issues/19635
 [#19784]: https://github.com/JuliaLang/julia/issues/19784
 [#20005]: https://github.com/JuliaLang/julia/issues/20005
-[#20022]: https://github.com/JuliaLang/julia/issues/20022
 [#20164]: https://github.com/JuliaLang/julia/issues/20164
 [#20321]: https://github.com/JuliaLang/julia/issues/20321
 [#20974]: https://github.com/JuliaLang/julia/issues/20974

src/Compat.jl

@@ -142,15 +142,6 @@ else
     end
 end
 
-@static if VERSION < v"0.6.0-dev.2093" # Compat.isapprox to allow for NaNs
-    using Base.rtoldefault
-    function isapprox(x::Number, y::Number; rtol::Real=rtoldefault(x,y), atol::Real=0, nans::Bool=false)
-        x == y || (isfinite(x) && isfinite(y) && abs(x-y) <= atol + rtol*max(abs(x), abs(y))) || (nans && isnan(x) && isnan(y))
-    end
-else
-    import Base.isapprox
-end
-
 @static if !isdefined(Base, :isabstracttype) # VERSION < v"0.7.0-DEV.3475"
     const isabstracttype = Base.isabstract
     export isabstracttype

test/runtests.jl

@@ -60,10 +60,6 @@ let
     @test A*D == copy(A) * Diagonal(copy(x))
 end
 
-# julia#20022
-@test !Compat.isapprox(NaN, NaN)
-@test Compat.isapprox(NaN, NaN, nans=true)
-
 # julia#13998
 for x in (3.1, -17, 3//4, big(111.1), Inf)
     local x