github.com/cockroachdb/tools@v0.0.0-20230222021103-a6d27438930d/go/analysis/passes/errorsas/testdata/src/a/a.go (about)

     1  // Copyright 2019 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // This file contains tests for the errorsas checker.
     6  
     7  package a
     8  
     9  import "errors"
    10  
    11  type myError int
    12  
    13  func (myError) Error() string { return "" }
    14  
    15  func perr() *error { return nil }
    16  
    17  type iface interface {
    18  	m()
    19  }
    20  
    21  func two() (error, interface{}) { return nil, nil }
    22  
    23  func _() {
    24  	var (
    25  		e  error
    26  		m  myError
    27  		i  int
    28  		f  iface
    29  		ei interface{}
    30  	)
    31  	errors.As(nil, &e)     // want `second argument to errors.As should not be \*error`
    32  	errors.As(nil, &m)     // *T where T implemements error
    33  	errors.As(nil, &f)     // *interface
    34  	errors.As(nil, perr()) // want `second argument to errors.As should not be \*error`
    35  	errors.As(nil, ei)     //  empty interface
    36  
    37  	errors.As(nil, nil) // want `second argument to errors.As must be a non-nil pointer to either a type that implements error, or to any interface type`
    38  	errors.As(nil, e)   // want `second argument to errors.As must be a non-nil pointer to either a type that implements error, or to any interface type`
    39  	errors.As(nil, m)   // want `second argument to errors.As must be a non-nil pointer to either a type that implements error, or to any interface type`
    40  	errors.As(nil, f)   // want `second argument to errors.As must be a non-nil pointer to either a type that implements error, or to any interface type`
    41  	errors.As(nil, &i)  // want `second argument to errors.As must be a non-nil pointer to either a type that implements error, or to any interface type`
    42  	errors.As(two())
    43  }