/usr/share/nvim/runtime/macros/matchit.vim is in neovim-runtime 0.2.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | " This file is a compatibility stub for any plugins which source it.
" Nvim already loads the matchit plugin by default; see ':help pi_matchit.txt'.
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