test/broadcast: put r1, r2, ratio, m into let (JuliaLang#36817)

test/broadcast.jl

@@ -152,15 +152,16 @@ for arr in (identity, as_sub)
  end
 end
 
-r1 = 1:1
-r2 = 1:5
-ratio = [1,1/2,1/3,1/4,1/5]
-@test r1.*r2 == [1:5;]
-@test r1./r2 == ratio
-m = [1:2;]'
-@test m.*r2 == [1:5 2:2:10]
-@test m./r2 ≈ [ratio 2ratio]
-@test m./[r2;] ≈ [ratio 2ratio]
+let r1 = 1:1,
+ r2 = 1:5,
+ ratio = [1,1/2,1/3,1/4,1/5],
+ m = [1:2;]'
+ @test r1.*r2 == [1:5;]
+ @test r1./r2 == ratio
+ @test m.*r2 == [1:5 2:2:10]
+ @test m./r2 ≈ [ratio 2ratio]
+ @test m./[r2;] ≈ [ratio 2ratio]
+end
 
 @test @inferred(broadcast(+,[0,1.2],reshape([0,-2],1,1,2))) == reshape([0 -2; 1.2 -0.8],2,1,2)
 rt = Base.return_types(broadcast, Tuple{typeof(+), Array{Float64, 3}, Array{Int, 1}})