errors

func AsType ¶

func AsType[E error](err error) (E, bool)

AsType finds the first error in err's tree that matches the type E, and if one is found, returns that error value and true. Otherwise, it returns the zero value of E and false.

The tree consists of err itself, followed by the errors obtained by repeatedly calling its Unwrap() error or Unwrap() []error method. When err wraps multiple errors, AsType examines err followed by a depth-first traversal of its children.

An error err matches the type E if the type assertion err.(E) holds, or if the error has a method As(any) bool such that err.As(target) returns true when target is a non-nil *E. In the latter case, the As method is responsible for setting target.