return vmkcall(typecheck.LookupRuntime(name), t, init, args)
}

func mkcallstmt(name string, args ...ir.Node) ir.Node {
	return mkcallstmt1(typecheck.LookupRuntime(name), args...)
}

func mkcall1(fn ir.Node, t *types.Type, init *ir.Nodes, args ...ir.Node) *ir.CallExpr {
	return vmkcall(fn, t, init, args)
}

func mkcallstmt1(fn ir.Node, args ...ir.Node) ir.Node {
	var init ir.Nodes

		init = append(init, mkcallstmt1(fn, reflectdata.RangeMapRType(base.Pos, nrange), ha, typecheck.NodAddr(hit)))
		nfor.Cond = ir.NewBinaryExpr(base.Pos, ir.ONE, ir.NewSelectorExpr(base.Pos, ir.ODOT, hit, keysym), typecheck.NodNil())

		fn = typecheck.LookupRuntime("mapiternext", th)
		nfor.Post = mkcallstmt1(fn, typecheck.NodAddr(hit))

	base.Pos = lno
}

func walkSelectCases(cases []*ir.CommClause) []ir.Node {
	ncas := len(cases)
	sellineno := base.Pos

	// optimization: zero-case select
	if ncas == 0 {
		return []ir.Node{mkcallstmt("block")}
	}

	// optimization: one-case select: single op.
	if ncas == 1 {
		cas := cases[0]
		ir.SetPos(cas)
		l := cas.Init()
		if cas.Comm != nil { // not default:
			n := cas.Comm