simplify changes

base/rational.jl

@@ -403,18 +403,6 @@ function *(y::Integer, x::Rational)
 end
 /(x::Rational, y::Union{Rational, Integer}) = x//y
 /(x::Integer, y::Rational) = x//y
-# Avoid overflow for Rational math if result is zero.
-# This method is needed because previously this method didn't check for overflows
-# but would return the correct answer if `a` was zero even if 1//z was wrong.
-function /(a::Rational, z::Complex{<:Integer})
-    z_r = complex(Rational(real(z)), Rational(imag(z)))
-    if iszero(a) && !iszero(z)
-        a/oneunit(z_r)
-    else
-        a/z_r
-    end
-end
-
 inv(x::Rational) = checked_den(x.den, x.num)
 
 fma(x::Rational, y::Rational, z::Rational) = x*y+z

test/rational.jl

@@ -203,7 +203,6 @@ end
     end
 
     @test Rational(rand_int, 3)/Complex(3, 2) == Complex(Rational(rand_int, 13), -Rational(rand_int*2, 39))
-    @test iszero(zero(Rational{Int8}) / complex(Int8(100), Int8(100)))
     @test (true//true) / complex(false, true) === 0//1 - 1//1*im
     @test (false//true) / complex(false, true) === 0//1 + 0//1*im
     @test (false//true) / complex(true, false) === 0//1 + 0//1*im