/usr/share/joe/syntax/mason.jsf is in joe 3.7-2.3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # JOE syntax file for Mason
=Idle
# Call HTML with mason flag. It will call perl.
:idle Idle
* idle noeat call=html.html(mason)
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