issue4215.go

     1  // errorcheck
     2  
     3  // Copyright 2016 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  package main
     8  
     9  func foo() (int, int) {
    10  	return 2.3 // ERROR "not enough return values\n\thave \(number\)\n\twant \(int, int\)|not enough arguments to return"
    11  }
    12  
    13  func foo2() {
    14  	return int(2), 2 // ERROR "too many (arguments to return|return values)\n\thave \(int, number\)\n\twant \(\)|return with value in function with no return type"
    15  }
    16  
    17  func foo3(v int) (a, b, c, d int) {
    18  	if v >= 0 {
    19  		return 1 // ERROR "not enough return values\n\thave \(number\)\n\twant \(int, int, int, int\)|not enough arguments to return"
    20  	}
    21  	return 2, 3 // ERROR "not enough return values\n\thave \(number, number\)\n\twant \(int, int, int, int\)|not enough arguments to return"
    22  }
    23  
    24  func foo4(name string) (string, int) {
    25  	switch name {
    26  	case "cow":
    27  		return "moo" // ERROR "not enough return values\n\thave \(string\)\n\twant \(string, int\)|not enough arguments to return"
    28  	case "dog":
    29  		return "dog", 10, true // ERROR "too many return values\n\thave \(string, number, bool\)\n\twant \(string, int\)|too many arguments to return"
    30  	case "fish":
    31  		return "" // ERROR "not enough return values\n\thave \(string\)\n\twant \(string, int\)|not enough arguments to return"
    32  	default:
    33  		return "lizard", 10
    34  	}
    35  }
    36  
    37  type S int
    38  type T string
    39  type U float64
    40  
    41  func foo5() (S, T, U) {
    42  	if false {
    43  		return "" // ERROR "not enough return values\n\thave \(string\)\n\twant \(S, T, U\)|not enough arguments to return"
    44  	} else {
    45  		ptr := new(T)
    46  		return ptr // ERROR "not enough return values\n\thave \(\*T\)\n\twant \(S, T, U\)|not enough arguments to return"
    47  	}
    48  	return new(S), 12.34, 1 + 0i, 'r', true // ERROR "too many return values\n\thave \(\*S, number, number, number, bool\)\n\twant \(S, T, U\)|too many arguments to return"
    49  }
    50  
    51  func foo6() (T, string) {
    52  	return "T", true, true // ERROR "too many return values\n\thave \(string, bool, bool\)\n\twant \(T, string\)|too many arguments to return"
    53  }
    54
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