| // 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|redeclared" | 
 | 	F2(i, i int) // ERROR "duplicate argument i|redefinition|previous|redeclared" | 
 | 	F3() (i, i int) // ERROR "duplicate argument i|redefinition|previous|redeclared" | 
 | } | 
 |  | 
 | var T1 func(i, i int) // ERROR "duplicate argument i|redefinition|previous|redeclared" | 
 | var T2 func(i int) (i int) // ERROR "duplicate argument i|redefinition|previous|redeclared" | 
 | var T3 func() (i, i int) // ERROR "duplicate argument i|redefinition|previous|redeclared" |