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Source file test/named1.go

Documentation: test

     1  // errorcheck
     2  
     3  // Copyright 2009 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  // Test that basic operations on named types are valid
     8  // and preserve the type.
     9  // Does not compile.
    10  
    11  package main
    12  
    13  type Bool bool
    14  
    15  type Map map[int]int
    16  
    17  func (Map) M() {}
    18  
    19  type Slice []byte
    20  
    21  var slice Slice
    22  
    23  func asBool(Bool)     {}
    24  func asString(String) {}
    25  
    26  type String string
    27  
    28  func main() {
    29  	var (
    30  		b    Bool = true
    31  		i, j int
    32  		c    = make(chan int)
    33  		m    = make(Map)
    34  	)
    35  
    36  	asBool(b)
    37  	asBool(!b)
    38  	asBool(true)
    39  	asBool(*&b)
    40  	asBool(Bool(true))
    41  	asBool(1 != 2) // ok now
    42  	asBool(i < j)  // ok now
    43  
    44  	_, b = m[2] // ok now
    45  
    46  	var inter interface{}
    47  	_, b = inter.(Map) // ok now
    48  	_ = b
    49  
    50  	var minter interface {
    51  		M()
    52  	}
    53  	_, b = minter.(Map) // ok now
    54  	_ = b
    55  
    56  	_, bb := <-c
    57  	asBool(bb) // ERROR "cannot use.*type bool.*as type Bool"
    58  	_, b = <-c // ok now
    59  	_ = b
    60  
    61  	asString(String(slice)) // ok
    62  }
    63  

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