You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: a.go
    path of file: ./repos/cockroach/pkg/testutils/lint/passes/returnerrcheck/testdata/src/a
    
    the code of the file until where you have to start completion: // Copyright 2019 The Cockroach Authors.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.

package a

import (
	"errors"
	"fmt"
	"log"
)

func noReturn() {
	err := errors.New("foo")
	if err != nil {
		return
	}
	_ = func() error {
		if err != nil {
			return nil // want `unexpected nil error return after checking for a non-nil error`
		}
		return nil
	}()
	
    
func AcceptableBehavior() {
	type structThing struct {
		err error
	}
	_ = func() error {
		var t structThing
		// Intentionally don't error if the check is not for an ident directly but
		// rather is for a field.
		if t.err != nil {
			return nil
		}
		return nil
	}
	_ = func() error {
		if err := errors.New("foo"); err != nil {
			log.Printf("%v", err)
			return nil
		}
		return nil
	}
	var t structThing
	_ = func() error {
		if err := errors.New("foo"); err != nil {
			t.err = err
			return nil
		}
		return nil
	}
	func() error {
		if err := errors.New("foo"); err != nil {
			t = structThing{err: err}
			return nil
		}
		return nil
	}()
	func() error {
		if err := errors.New("foo"); err != nil || true {
			if err != nil {
				return err
			}
			return nil
		}
		return nil
	}()
	func() (string, error) {
		if err := errors.New("foo"); err != nil {
			return err.Error(), nil
		}
		return "", nil
	}()
}