Don't use begin in indexing

Author: jishnub

test/runtests.jl

@@ -409,8 +409,8 @@ end
         @test first(x,2) == first(y,2)
         @test Base.IteratorSize(y) == Base.IteratorSize(x)
         s = Iterators.Stateful(y)
-        @test first(s, 2) == y[begin .+ (0:1)]
-        @test first(s, 2) == y[begin .+ (2:3)]
+        @test first(s, 2) == x[1:2]
+        @test first(s, 2) == x[3:4]
     end
 end