Cause retrieves the underlying cause of an error.

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

HasStackTrace tells you if the given error contains a stack trace.

New returns an error with the supplied message.

WithStack annotates err with a stack trace at the point WithStack was called.

Wrap returns an error annotating err with a stack trace at the point Wrap is called, and the supplied message.

Wrapf returns an error annotating err with a stack trace at the point Wrapf is called, and the format specifier.