IOContext(::IO, ::Pair, ::Pair...)

README.md

@@ -195,6 +195,8 @@ Currently, the `@compat` macro supports the following syntaxes:
 * `@compat finalizer(func, obj)` with the finalizer to run as the first argument and the object to be finalized
   as the second ([#24605]).
 
+* `IOContext` accepting key-value `Pair`s ([#23271]).
+
 ## Renaming
 
 
@@ -358,6 +360,7 @@ includes this fix. Find the minimum version from there.
 [#22864]: https://github.com/JuliaLang/julia/issues/22864
 [#23051]: https://github.com/JuliaLang/julia/issues/23051
 [#23235]: https://github.com/JuliaLang/julia/issues/23235
+[#23271]: https://github.com/JuliaLang/julia/issues/23271
 [#23427]: https://github.com/JuliaLang/julia/issues/23427
 [#23570]: https://github.com/JuliaLang/julia/issues/23570
 [#23666]: https://github.com/JuliaLang/julia/issues/23666
@@ -367,6 +370,7 @@ includes this fix. Find the minimum version from there.
 [#23931]: https://github.com/JuliaLang/julia/issues/23931
 [#24047]: https://github.com/JuliaLang/julia/issues/24047
 [#24282]: https://github.com/JuliaLang/julia/issues/24282
+[#24361]: https://github.com/JuliaLang/julia/issues/24361
 [#24372]: https://github.com/JuliaLang/julia/issues/24372
 [#24459]: https://github.com/JuliaLang/julia/issues/24459
 [#24605]: https://github.com/JuliaLang/julia/issues/24605

src/Compat.jl

@@ -807,6 +807,13 @@ end
     (::Type{Array{T}}){T}(s::UniformScaling, m::Integer, n::Integer) = Matrix{T}(s, m, n)
 end
 
+# https://github.com/JuliaLang/julia/pull/23271
+@static if VERSION < v"0.7.0-DEV.1472"
+    Base.IOContext(io::IO, arg1::Pair, arg2::Pair, args::Pair...) = IOContext(IOContext(io, arg1), arg2, args...)
+    # needed for ambiguity resolution
+    Base.IOContext(io::IOContext, arg1::Pair, arg2::Pair) = IOContext(IOContext(io, arg1), arg2)
+end
+
 # 0.7.0-DEV.2581
 @static if !isdefined(Base, :Uninitialized)
     if VERSION >= v"0.6.0"

test/runtests.jl

@@ -912,6 +912,10 @@ end
 @test isa(Array{Float64}(uninitialized, 2, 2), Matrix{Float64})
 @test isa(Array{Float64,3}(uninitialized, 2, 2, 2), Array{Float64,3})
 
+# 0.7.0-DEV.1472
+@test get(IOContext(IOBuffer(), :arg1=>true, :arg2=>true, :arg3=>true), :arg3, false)
+@test get(IOContext(IOBuffer(), :arg1=>true, :arg2=>true), :arg2, false)
+
 # 0.7.0-DEV.2338
 module Test24361
     using Compat