inherit original name for convert.back

index.js

@@ -41,7 +41,7 @@ convert.back = function (mw) {
     // assume it's generator middleware
     return mw
   }
-  return function * (next) {
+  const converted = function * (next) {
     let ctx = this
     let called = false
     // no need try...catch here, it's ok even `mw()` throw exception
@@ -55,4 +55,6 @@ convert.back = function (mw) {
       return co.call(ctx, next)
     }))
   }
+  converted._name = mw._name || mw.name
+  return converted
 }

test.js

@@ -201,6 +201,11 @@ describe('convert.back()', () => {
       .expect(200, [1, 2, 'next() called multiple times'])
       .end(done)
   })
+
+  it('should inherit the original middleware name', () => {
+    let mw = convert.back(function testing (ctx, next) {})
+    assert.strictEqual(mw._name, 'testing')
+  })
 })
 
 describe('migration snippet', () => {