/usr/share/THE/diff.tld is in the 3.3~rc1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | *
* This file contains the THE Language Definition for diff files
*
* Name = *DIFF
*
:case
respect
:header
line diff column 1 alt a
line --- column 1 alt a
line +++ column 1 alt a
line @@ column 1 alt c
line - column 1 alt b
line + column 1 alt d
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