Support v-for on iterators.

Author: mitar

src/core/instance/render-helpers/render-list.js

@@ -24,6 +24,14 @@ export function renderList (
     for (i = 0; i < val; i++) {
       ret[i] = render(i + 1, i)
     }
+  } else if (typeof Symbol !== 'undefined' && Symbol.iterator && val[Symbol.iterator]) {
+    ret = []
+    const iterator = val[Symbol.iterator]()
+    while (true) {
+      const value = iterator.next()
+      if (value.done) break
+      ret.push(render(value.value, ret.length))
+    }
   } else if (isObject(val)) {
     keys = Object.keys(val)
     ret = new Array(keys.length)