91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
//args: -Eerrorlint
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package testdata
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import (
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"errors"
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"log"
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)
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var errFoo = errors.New("foo")
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func doThing() error {
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return errFoo
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}
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func compare() {
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err := doThing()
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if errors.Is(err, errFoo) {
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log.Println("ErrFoo")
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}
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if err == nil {
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log.Println("nil")
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}
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if err != nil {
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log.Println("nil")
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}
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if nil == err {
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log.Println("nil")
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}
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if nil != err {
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log.Println("nil")
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}
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if err == errFoo { // ERROR "comparing with == will fail on wrapped errors. Use errors.Is to check for a specific error"
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log.Println("errFoo")
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}
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if err != errFoo { // ERROR "comparing with != will fail on wrapped errors. Use errors.Is to check for a specific error"
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log.Println("not errFoo")
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}
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if errFoo == err { // ERROR "comparing with == will fail on wrapped errors. Use errors.Is to check for a specific error"
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log.Println("errFoo")
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}
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if errFoo != err { // ERROR "comparing with != will fail on wrapped errors. Use errors.Is to check for a specific error"
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log.Println("not errFoo")
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}
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switch err { // ERROR "switch on an error will fail on wrapped errors. Use errors.Is to check for specific errors"
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case errFoo:
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log.Println("errFoo")
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}
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switch doThing() { // ERROR "switch on an error will fail on wrapped errors. Use errors.Is to check for specific errors"
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case errFoo:
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log.Println("errFoo")
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}
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}
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type myError struct{}
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func (*myError) Error() string {
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return "foo"
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}
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func doAnotherThing() error {
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return &myError{}
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}
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func typeCheck() {
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err := doAnotherThing()
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var me *myError
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if errors.As(err, &me) {
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log.Println("myError")
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}
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_, ok := err.(*myError) // ERROR "type assertion on error will fail on wrapped errors. Use errors.As to check for specific errors"
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if ok {
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log.Println("myError")
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}
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switch err.(type) { // ERROR "type switch on error will fail on wrapped errors. Use errors.As to check for specific errors"
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case *myError:
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log.Println("myError")
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}
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switch doAnotherThing().(type) { // ERROR "type switch on error will fail on wrapped errors. Use errors.As to check for specific errors"
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case *myError:
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log.Println("myError")
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}
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switch t := err.(type) { // ERROR "type switch on error will fail on wrapped errors. Use errors.As to check for specific errors"
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case *myError:
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log.Println("myError", t)
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}
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switch t := doAnotherThing().(type) { // ERROR "type switch on error will fail on wrapped errors. Use errors.As to check for specific errors"
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case *myError:
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log.Println("myError", t)
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}
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}
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