increase test coverage

packages/babel-plugin-transform-regenerator/package.json

@@ -1,7 +1,7 @@
 {
   "name": "babel-plugin-transform-regenerator",
   "author": "Ben Newman <bn@cs.stanford.edu>",
-  "description": "",
+  "description": "Explode async and generator functions into a state machine.",
   "version": "6.0.18",
   "homepage": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-regenerator",
   "main": "lib/index.js",

packages/babel-plugin-transform-regenerator/src/visit.js

@@ -37,13 +37,7 @@ exports.visitor = {
         return;
       }
 
-      if (node.expression) {
-        // Transform expression lambdas into normal functions.
-        node.expression = false;
-        node.body = t.blockStatement([
-          t.returnStatement(node.body)
-        ]);
-      }
+      path.ensureBlock();
 
       if (node.async) {
         path.get("body").traverse(awaitVisitor);