|  | // errorcheck | 
|  |  | 
|  | // Copyright 2013 The Go Authors. All rights reserved. | 
|  | // Use of this source code is governed by a BSD-style | 
|  | // license that can be found in the LICENSE file. | 
|  |  | 
|  | package p | 
|  |  | 
|  | var T interface { | 
|  | F1(i int) (i int) // ERROR "duplicate argument i|redefinition|previous" | 
|  | F2(i, i int) // ERROR "duplicate argument i|redefinition|previous" | 
|  | F3() (i, i int) // ERROR "duplicate argument i|redefinition|previous" | 
|  | } | 
|  |  | 
|  | var T1 func(i, i int) // ERROR "duplicate argument i|redefinition|previous" | 
|  | var T2 func(i int) (i int) // ERROR "duplicate argument i|redefinition|previous" | 
|  | var T3 func() (i, i int) // ERROR "duplicate argument i|redefinition|previous" |