|  | // run | 
|  |  | 
|  | // Copyright 2019 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. | 
|  |  | 
|  | // Check that deferring a nil function causes a proper | 
|  | // panic when the deferred function is invoked (not | 
|  | // when the function is deferred). | 
|  | // See Issue #8047 and #34926. | 
|  |  | 
|  | package main | 
|  |  | 
|  | var x = 0 | 
|  |  | 
|  | func main() { | 
|  | defer func() { | 
|  | err := recover() | 
|  | if err == nil { | 
|  | panic("did not panic") | 
|  | } | 
|  | if x != 1 { | 
|  | panic("FAIL") | 
|  | } | 
|  | }() | 
|  | f() | 
|  | } | 
|  |  | 
|  | func f() { | 
|  | var nilf func() | 
|  | defer nilf() | 
|  | x = 1 | 
|  | } |