I've installed ATS by typing the following commands:
```
sudo apt install ats2-lang
sudo apt install ats-lang-anairiats
```
My learn.dats file:
```
implement
main0 () = print("Hello, world!\n")
```
But atscc cannot compile it:
```
$ atscc -o hello learn.dats
/usr/lib/ats-anairiats-0.2.11/bin/atsopt --output learn_dats.c --dynamic learn.dats
/home/hirrolot/learn.dats: 13(line=4, offs=1) -- 48(line=4, offs=36): error(2): the dynamic identifier [main0] is unrecognized.
exit(ATS): uncaught exception: ATS_2d0_2e2_2e11_2src_2ats_error_2esats__FatalErrorException(1027)
```
The atscc version:
```
$ atscc --version
ATS/Anairiats version 0.2.11 with Copyright (c) 2002-2013 Hongwei Xi
gcc -I/usr/lib/ats-anairiats-0.2.11/ -I/usr/lib/ats-anairiats-0.2.11/ccomp/runtime/ -L/usr/lib/ats-anairiats-0.2.11/ccomp/lib64/ /usr/lib/ats-anairiats-0.2.11/ccomp/runtime/ats_prelude.c --version -lats
gcc (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
```
My OS:
```
hirrolot@hirrolot-desktop
MMMMMMMMMMMMMMMMMMMMMMMMMmds+. OS: Mint 19.1 tessa
MMm----::-://////////////oymNMd+` Kernel: x86_64 Linux 4.15.0-20-generic
MMd /++ -sNMd: Uptime: 5h 42m
MMNso/` dMM `.::-. .-::.` .hMN: Packages: 2194
ddddMMh dMM :hNMNMNhNMNMNh: `NMm Shell: bash 4.4.20
NMm dMM .NMN/-+MMM+-/NMN` dMM Resolution: 2560x1440
NMm dMM -MMm `MMM dMM. dMM DE: Cinnamon 4.0.10
NMm dMM -MMm `MMM dMM. dMM WM: Muffin
NMm dMM .mmd `mmm yMM. dMM WM Theme: Mint-Y-Dark (Mint-Y)
NMm dMM` ..` ... ydm. dMM GTK Theme: Mint-Y [GTK2/3]
hMM- +MMd/-------...-:sdds dMM Icon Theme: Mint-Y
-NMm- :hNMNNNmdddddddddy/` dMM Font: Noto Sans 9
-dMNs-``-::::-------.`` dMM CPU: Intel Core i7-6700 @ 8x 4GHz [44.0°C]
`/dMNmy+/:-------------:/yMMM GPU: NV136
./ydNMMMMMMMMMMMMMMMMMMMMM RAM: 3086MiB / 7927MiB
\.MMMMMMMMMMMMMMMMMMM
```
I guess that I have an old version of ATS. How can I fix it?