BitArray constructors for uninitialized (#429)

README.md

@@ -192,6 +192,8 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 * `Uninitialized` and `uninitialized` with corresponding `Array` constructors ([#24652]).
 
+* `BitArray` constructors for `uninitialized` ([#24785]).
+
 * `@compat finalizer(func, obj)` with the finalizer to run as the first argument and the object to be finalized
   as the second ([#24605]).
 
@@ -376,3 +378,4 @@ includes this fix. Find the minimum version from there.
 [#24605]: https://github.com/JuliaLang/julia/issues/24605
 [#24652]: https://github.com/JuliaLang/julia/issues/24652
 [#24657]: https://github.com/JuliaLang/julia/issues/24657
+[#24785]: https://github.com/JuliaLang/julia/issues/24785

src/Compat.jl

@@ -823,6 +823,9 @@ end
             Array{T,N}(::Uninitialized, args...) where {T,N} = Array{T,N}(args...)
             Vector(::Uninitialized, args...) = Vector(args...)
             Matrix(::Uninitialized, args...) = Matrix(args...)
+
+            BitArray{N}(::Uninitialized, args...) where {N} = BitArray{N}(args...)
+            BitArray(::Uninitialized, args...) = BitArray(args...)
         """)
     else
         include_string(@__MODULE__, """
@@ -831,6 +834,9 @@ end
             (::Type{Array{T,N}}){T,N}(::Uninitialized, args...) = Array{T,N}(args...)
             (::Type{Vector})(::Uninitialized, args...) = Vector(args...)
             (::Type{Matrix})(::Uninitialized, args...) = Matrix(args...)
+
+            (::Type{BitArray{N}}){N}(::Uninitialized, args...) = BitArray{N}(args...)
+            (::Type{BitArray})(::Uninitialized, args...) = BitArray(args...)
         """)
     end
     const uninitialized = Uninitialized()

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.2687
+@test isa(BitVector(uninitialized, 2), BitVector)
+@test isa(BitArray(uninitialized, 2, 2), BitMatrix)
+
 # 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)