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Source file test/declbad.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 incorrect short declarations and redeclarations are detected.
     8  // Does not compile.
     9  
    10  package main
    11  
    12  func f1() int                    { return 1 }
    13  func f2() (float32, int)         { return 1, 2 }
    14  func f3() (float32, int, string) { return 1, 2, "3" }
    15  
    16  func main() {
    17  	{
    18  		// simple redeclaration
    19  		i := f1()
    20  		i := f1() // ERROR "redeclared|no new"
    21  		_ = i
    22  	}
    23  	{
    24  		// change of type for f
    25  		i, f, s := f3()
    26  		f, g, t := f3() // ERROR "redeclared|cannot assign|incompatible"
    27  		_, _, _, _, _ = i, f, s, g, t
    28  	}
    29  	{
    30  		// change of type for i
    31  		i, f, s := f3()
    32  		j, i, t := f3() // ERROR "redeclared|cannot assign|incompatible"
    33  		_, _, _, _, _ = i, f, s, j, t
    34  	}
    35  	{
    36  		// no new variables
    37  		i, f, s := f3()
    38  		i, f := f2() // ERROR "redeclared|no new"
    39  		_, _, _ = i, f, s
    40  	}
    41  	{
    42  		// multiline no new variables
    43  		i := f1
    44  		i := func() int { // ERROR "redeclared|no new|incompatible"
    45  			return 0
    46  		}
    47  		_ = i
    48  	}
    49  	{
    50  		// single redeclaration
    51  		i, f, s := f3()
    52  		i := 1 // ERROR "redeclared|no new|incompatible"
    53  		_, _, _ = i, f, s
    54  	}
    55  	// double redeclaration
    56  	{
    57  		i, f, s := f3()
    58  		i, f := f2() // ERROR "redeclared|no new"
    59  		_, _, _ = i, f, s
    60  	}
    61  	{
    62  		// triple redeclaration
    63  		i, f, s := f3()
    64  		i, f, s := f3() // ERROR "redeclared|no new"
    65  		_, _, _ = i, f, s
    66  	}
    67  }
    68  

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