Fix field name building in type_check.lua
Fix field name building in type_check.lua

Use 'parent[field]' notation for non-string fields.

keplerproject/luarocks,robooo/luarocks,xpol/luavm,xpol/luainstaller,xpol/luarocks,robooo/luarocks,luarocks/luarocks,keplerproject/luarocks,tarantool/luarocks,xpol/luarocks,xpol/luavm,robooo/luarocks,xpol/luavm,xpol/luavm,robooo/luarocks,luarocks/luarocks,xpol/luainstaller,keplerproject/luarocks,keplerproject/luarocks,luarocks/luarocks,xpol/luainstaller,tarantool/luarocks,xpol/luarocks,tarantool/luarocks,xpol/luainstaller,xpol/luavm,xpol/luarocks