add function.sent

packages/babel-plugin-transform-regenerator/test/fixtures/function-sent/example/exec.js

@@ -0,0 +1,19 @@
+function *adder(total = 0) {
+  let increment = 1;
+  while (true) {
+    let request = function.sent;
+    switch (request) {
+      case undefined: break;
+      case "done": return total;
+      default: increment = Number(request);
+    }
+    yield total += increment;
+  }
+}
+
+let tally = adder();
+tally.next(0.1);
+tally.next(0.1);
+tally.next(0.1);
+let last = tally.next("done");
+assert.equal(last.value, 0.30000000000000004);