Cause returns the underlying cause of the error, if possible.

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

IsCode reports whether any error in err's chain contains the given error code.

MustRegister register a user define error code.

New returns an error with the supplied message.

ParseCoder parse any error into *withCode.

Register register a user define error code.

WithMessage annotates err with a new message.

WithMessagef annotates err with the format specifier.

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.

Coder defines an interface for an error code detail information.

Frame represents a program counter inside a stack frame.

StackTrace is stack of Frames from innermost (newest) to outermost (oldest).