Fix real(Complex{<:AbstractFloat}) (#33107)

Keno · JeffBezanson · web-flow · commit f4c23dfb145a · 2019-09-04T18:41:10.000-07:00
Co-Authored-By: Jeff Bezanson &lt;jeff.bezanson@gmail.com&gt;
diff --git a/base/complex.jl b/base/complex.jl
@@ -108,7 +108,7 @@ Float64
 """
 real(T::Type) = typeof(real(zero(T)))
 real(::Type{T}) where {T<:Real} = T
-real(::Type{Complex{T}}) where {T<:Real} = T
+real(C::Type{<:Complex}) = fieldtype(C, 1)
 
 """
     isreal(x) -> Bool
diff --git a/test/complex.jl b/test/complex.jl
@@ -1148,3 +1148,6 @@ end
         @test isequal(ComplexF64(cscd(T(-1000, 100000))), ComplexF64(0.0, -0.0))
     end
 end
+
+# real(C) with C a Complex Unionall
+@test real(Complex{<:AbstractFloat}) == AbstractFloat
