func (st *state) fail(err string) {
	panic(demangleErr{err: err, off: st.off})
}

// failEarlier is like fail, but decrements the offset to indicate
// that the point of failure occurred earlier in the string.
func (st *state) failEarlier(err string, dec int) {
	if st.off < dec {
		panic("internal error")
	}
	panic(demangleErr{err: err, off: st.off - dec})
}