66 lines
1.3 KiB
Go
66 lines
1.3 KiB
Go
package main
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import (
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"errors"
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"fmt"
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)
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type CustomError struct {
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fieldName string
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}
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type CustomError2 struct {
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fieldName string
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}
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func (c CustomError) Error() string {
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return fmt.Sprintf("missing field: %s", c.fieldName)
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}
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func (c CustomError) Is(target error) bool {
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return c.Error() == target.Error()
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}
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func (c CustomError2) Error() string {
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return fmt.Sprintf("missing field: %s", c.fieldName)
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}
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func (c CustomError2) Is(target error) bool {
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return c.Error() == target.Error()
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}
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func main() {
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test1 := CustomError{"Test1"}
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test2 := CustomError2{"Test2"}
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test3 := fmt.Errorf("Test3 %w", test1)
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test4 := fmt.Errorf("Test4: %w", test3)
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if errors.As(test3, &test1) {
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fmt.Println("Test3 contains Test1")
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fmt.Printf("Test3 contains Test1 field: %s", test3.Error())
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} else {
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fmt.Println("Test3 doesn't contain Test1")
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}
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if errors.As(test3, &test2) {
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fmt.Println("Test3 contains Test2")
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} else {
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fmt.Println("Test3 doesn't contain Test1")
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}
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if errors.As(test4, &test1) {
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fmt.Println("Test4 contains Test1")
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} else {
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fmt.Println("Test3 doesn't contain Test1")
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}
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if errors.As(test4, &test2) {
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fmt.Println("Test4 contains Test2")
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} else {
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fmt.Println("Test3 doesn't contain Test1")
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}
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if errors.As(test4, &test3) {
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fmt.Println("Test4 contains Test3")
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} else {
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fmt.Println("Test3 doesn't contain Test1")
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}
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}
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