As finds the first error in chain that matches target, and if one is found, sets.

Errorf formats according to a format specifier and returns the string as a value that satisfies error.

FormatAsSentences option converts standard Go error message to sentence.

FormatWithStack option includes stack trace in each error message.

FormatWithUnwrap option prints also all wrapped errors.

Is reports whether any error in chain matches target.

New returns an error from the given text, stack trace is included.

Unwrap returns the result of calling the Unwrap method on err.

Wrap wraps the error with a different message.

Wrapf wraps the error with a different message.

Formatter is a configurable error formatter.

MessageFormatter formats each error message.

PrefixFormatter formats a prefix followed by a list of errors, see defaultPrefixFormatter.