counter.fc:4:12: error: undefined function get_data, defining a global function of unknown type
var ds = get_data().begin_parse();
^
counter.fc:4:22: error: undefined function .begin_parse, defining a global function of unknown type
var ds = get_data().begin_parse();
^
counter.fc:9:3: error: undefined function set_data, defining a global function of unknown type
set_data(begin_cell()
^
counter.fc:9:12: error: undefined function begin_cell, defining a global function of unknown type
set_data(begin_cell()
^
counter.fc:11:5: error: undefined function .end_cell, defining a global function of unknown type
.end_cell());
^
counter.fc:17:18: error: undefined function .slice_empty?, defining a global function of unknown type
if (in_msg_body.slice_empty?()) {