}
	return cfg.Clone()
}

type connLRU struct {
	ll *list.List // list.Element.Value type is of *persistConn
	m  map[*persistConn]*list.Element
}

// add adds pc to the head of the linked list.
func (cl *connLRU) add(pc *persistConn) {
	if cl.ll == nil {
		cl.ll = list.New()
		cl.m = make(map[*persistConn]*list.Element)
	}
	ele := cl.ll.PushFront(pc)
	if _, ok := cl.m[pc]; ok {

	return register(bits.TrailingZeros64(uint64(r)))
}

type use struct {
	dist int32    // distance from start of the block to a use of a value
	pos  src.XPos // source position of the use
	next *use     // linked list of uses of a value in nondecreasing dist order
}

// A valState records the register allocation state for a (pre-regalloc) value.
type valState struct {

				st.fail("expected _ after _BitInt size")
			}
			st.advance(1)
			ret = &BitIntType{Size: size, Signed: signed}

		case 'k':
			constraint, _ := st.name()
			ret = &SuffixType{
				Base:   constraint,
				Suffix: "auto",
			}

		case 'K':
			constraint, _ := st.name()
			ret = &SuffixType{
				Base:   constraint,
				Suffix: "decltype(auto)",
			}