skip flow types when finding rest parameter references

src/babel/transformation/transformers/es6/parameters/rest.js

@@ -9,6 +9,11 @@ var memberExpressionOptimisationVisitor = {
     }
   },
 
+  Flow() {
+    // don't touch reference in type annotations
+    this.skip();
+  },
+
   Function(node, parent, scope, state) {
     // skip over functions as whatever `arguments` we reference inside will refer
     // to the wrong function

test/core/fixtures/transformation/es6.parameters/rest-flow-parameter-reference/actual.js

@@ -0,0 +1,9 @@
+function foo(
+  x: Object,
+  ...types
+): { types: Array<number>, x: Object } {
+  return {
+    types: types,
+    x: x,
+  };
+}

test/core/fixtures/transformation/es6.parameters/rest-flow-parameter-reference/expected.js

@@ -0,0 +1,12 @@
+"use strict";
+
+function foo(x) {
+  for (var _len = arguments.length, types = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    types[_key - 1] = arguments[_key];
+  }
+
+  return {
+    types: types,
+    x: x
+  };
+}