if n := arrayClear(n.X.Pos(), n.X, nil); n != nil {
			return n
		}
		// If n == nil, we are clearing an array which takes zero memory, do nothing.
		return ir.NewBlockStmt(n.Pos(), nil)
	case typ.IsMap():
		return mapClear(n.X, reflectdata.TypePtrAt(n.X.Pos(), n.X.Type()))
	}
	panic("unreachable")
}

// walkClose walks an OCLOSE node.
func walkClose(n *ir.UnaryExpr, init *ir.Nodes) ir.Node {