/usr/share/source-highlight/clike_vardeclaration.lang is in libsource-highlight-common 3.1.8-1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | (usertype,usertype,normal) =
`([[:alpha:]_](?:[^[:punct:][:space:]]|[_])*)
((?:<.*>)?)
(\s+(?=[*&]*[[:alpha:]_][^[:punct:][:space:]]*\s*[[:punct:]\[\]]+))`
|