Builtin metadata.map is not registered when parsing config file

[rmens]

Describe the bug
Parsing the config file generates an error in Liquidsoap 2.2.1.

To Reproduce
Create an empty .liq file and try to parse that:

root@liq:/var/log/liquidsoap# touch /tmp/empty.liq
root@liq:/var/log/liquidsoap# liquidsoap -p /tmp/empty.liq 
INFO: Loading Sdl_image, Target = linux
INFO: Loading Sdl_ttf, Target = linux
At /usr/share/liquidsoap-lang/libs/extra/deprecations.liq, line 96, char 17-38:
def map_metadata(%argsof(metadata.map), fn, s)

Error 3: Builtin metadata.map is not registered!

Expected behavior
Parse the file without errors.

Version details

• OS: Debian
• Version 22.04 (Liquidsoap 2.2.1)

Install method
DEB package

[vitoyucepi]

I can confirm this problem.
Liquidsoap in parse-only mode prints an error.

Versions: 88380cf, 2.2.1, 2.1.4, 2.0.7.

To reproduce
echo '' | liquidsoap --parse-only -

[toots]

Thanks for reporting. I have fixed the issue by disabling the deprecated layer when running in parse-only mode.