//args: -Eerrorlint //config_path: testdata/configs/errorlint_asserts.yml package testdata import ( "errors" "log" ) type myError struct{} func (*myError) Error() string { return "foo" } func errorLintDoAnotherThing() error { return &myError{} } func errorLintAsserts() { err := errorLintDoAnotherThing() var me *myError if errors.As(err, &me) { log.Println("myError") } _, ok := err.(*myError) // ERROR "type assertion on error will fail on wrapped errors. Use errors.As to check for specific errors" if ok { log.Println("myError") } switch err.(type) { // ERROR "type switch on error will fail on wrapped errors. Use errors.As to check for specific errors" case *myError: log.Println("myError") } switch errorLintDoAnotherThing().(type) { // ERROR "type switch on error will fail on wrapped errors. Use errors.As to check for specific errors" case *myError: log.Println("myError") } switch t := err.(type) { // ERROR "type switch on error will fail on wrapped errors. Use errors.As to check for specific errors" case *myError: log.Println("myError", t) } switch t := errorLintDoAnotherThing().(type) { // ERROR "type switch on error will fail on wrapped errors. Use errors.As to check for specific errors" case *myError: log.Println("myError", t) } }