This file is indexed.

/usr/share/highlight/langDefs/pltcl.lang is in highlight-common 3.41-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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-- Load PL/SQL definition
dofile(HL_LANG_DIR.."sql.lang")

Description="PL/Tcl"

NestedSections = {
  { Lang="tcl", Delimiter= { [[\$\$]], [[\$\$\s+LANGUAGE]] } },
}