SYS_MUNLOCK                  = 204 // { int munlock(const void *addr, size_t len); }
	SYS_UNDELETE                 = 205 // { int undelete(char *path); }
	SYS_FUTIMES                  = 206 // { int futimes(int fd, struct timeval *tptr); }
	SYS_GETPGID                  = 207 // { int getpgid(pid_t pid); }
	SYS_POLL                     = 209 // { int poll(struct pollfd *fds, u_int nfds, \

	SYS_MUNLOCK                  = 204 // { int munlock(const void *addr, size_t len); }
	SYS_UNDELETE                 = 205 // { int undelete(char *path); }
	SYS_FUTIMES                  = 206 // { int futimes(int fd, struct timeval *tptr); }
	SYS_GETPGID                  = 207 // { int getpgid(pid_t pid); }
	SYS_POLL                     = 209 // { int poll(struct pollfd *fds, u_int nfds, \

			return ir.OCONVNOP, ""
		}
	}

	// 5. src is the predeclared identifier nil and dst is a nillable type.
	if src.Kind() == types.TNIL {
		switch dst.Kind() {
		case types.TPTR,
			types.TFUNC,
			types.TMAP,
			types.TCHAN,
			types.TINTER,
			types.TSLICE:
			return ir.OCONVNOP, ""
		}
	}

	// 6. rule about untyped constants - already converted by DefaultLit.

	types.TCOMPLEX64:  "complex64",
	types.TCOMPLEX128: "complex128",
	types.TFLOAT32:    "float32",
	types.TFLOAT64:    "float64",
	types.TBOOL:       "bool",
	types.TSTRING:     "string",
	types.TPTR:        "pointer",
	types.TUNSAFEPTR:  "unsafe.Pointer",
	types.TSTRUCT:     "struct",
	types.TINTER:      "interface",
	types.TCHAN:       "chan",
	types.TMAP:        "map",
	types.TARRAY:      "array",

		case types.TINTER:
			if n.Type().IsEmptyInterface() {
				on = typecheck.LookupRuntime("printeface", n.Type())
			} else {
				on = typecheck.LookupRuntime("printiface", n.Type())
			}
		case types.TPTR:
			if n.Type().Elem().NotInHeap() {
				on = typecheck.LookupRuntime("printuintptr")
				n = ir.NewConvExpr(base.Pos, ir.OCONV, nil, n)
				n.SetType(types.Types[types.TUNSAFEPTR])

// t = type of sub-portion of v.
func clobberWalk(b *ssa.Block, v *ir.Name, offset int64, t *types.Type) {
	if !t.HasPointers() {
		return
	}
	switch t.Kind() {
	case types.TPTR,
		types.TUNSAFEPTR,
		types.TFUNC,
		types.TCHAN,
		types.TMAP:
		clobberPtr(b, v, offset)

	case types.TSTRING:
		// struct { byte *str; int len; }
		clobberPtr(b, v, offset)