github.com/yanyiwu/go@v0.0.0-20150106053140-03d6637dbb7f/test/complit1.go (about)

     1  // errorcheck
     2  
     3  // Copyright 2011 The Go Authors.  All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // Verify that illegal composite literals are detected.
     8  // Does not compile.
     9  
    10  package main
    11  
    12  var m map[int][3]int
    13  
    14  func f() [3]int
    15  
    16  func fp() *[3]int
    17  
    18  var mp map[int]*[3]int
    19  
    20  var (
    21  	_ = [3]int{1, 2, 3}[:] // ERROR "slice of unaddressable value"
    22  	_ = m[0][:]            // ERROR "slice of unaddressable value"
    23  	_ = f()[:]             // ERROR "slice of unaddressable value"
    24  
    25  	// these are okay because they are slicing a pointer to an array
    26  	_ = (&[3]int{1, 2, 3})[:]
    27  	_ = mp[0][:]
    28  	_ = fp()[:]
    29  )
    30  
    31  type T struct {
    32  	i    int
    33  	f    float64
    34  	s    string
    35  	next *T
    36  }
    37  
    38  var (
    39  	_ = &T{0, 0, "", nil}               // ok
    40  	_ = &T{i: 0, f: 0, s: "", next: {}} // ERROR "missing type in composite literal|omit types within composite literal"
    41  	_ = &T{0, 0, "", {}}                // ERROR "missing type in composite literal|omit types within composite literal"
    42  )