Put unique loop in another function

base/set.jl

@@ -134,18 +134,28 @@ function unique(itr)
     x, i = next(itr, i)
     if !isleaftype(T)
         T = typeof(x)
-        out = Vector{T}()
-        seen = Set{T}()
+        return _unique(itr, Vector{T}(), Set{T}(), x, i)
     end
     push!(seen, x)
     push!(out, x)
+    if !done(itr, i)
+        x, i = next(itr, i)
+    end
+    return unique(itr, out, seen, x, i)
+end
+
+@inline unique(itr, out, seen, x, i) = _unique(itr, out, seen, x, i)
+function _unique{T}(itr, out::Vector{T}, seen, x, i)
+    if !in(x, seen)
+        push!(seen, x)
+        push!(out, x)
+    end
     while !done(itr, i)
         x, i = next(itr, i)
         S = typeof(x)
         if !(S === T || S <: T)
-            T = typejoin(S, T)
-            seen = convert(Set{T}, seen)
-            out = convert(Vector{T}, out)
+            R = typejoin(S, T)
+            return _unique(itr, convert(Vector{R}, out), convert(Set{R}, seen), x, i)
         end
         if !in(x, seen)
             push!(seen, x)