Test arrow function inside generator. (#5605)

packages/babel-plugin-transform-regenerator/test/fixtures/arrow-inside-generator/actual.js

@@ -0,0 +1,5 @@
+function* gen () {
+  const a = () => {
+    return 1;
+  };
+}

packages/babel-plugin-transform-regenerator/test/fixtures/arrow-inside-generator/expected.js

@@ -0,0 +1,17 @@
+var _marked = [gen].map(regeneratorRuntime.mark);
+
+function gen() {
+  var a;
+  return regeneratorRuntime.wrap(function gen$(_context) {
+    while (1) switch (_context.prev = _context.next) {
+      case 0:
+        a = () => {
+          return 1;
+        };
+
+      case 1:
+      case "end":
+        return _context.stop();
+    }
+  }, _marked[0], this);
+}

packages/babel-plugin-transform-regenerator/test/fixtures/arrow-inside-generator/options.json

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    "transform-regenerator"
+  ]
+}