/usr/share/slsh/local-packages/gslmatrix.sl is in slang-gsl 0.7.0-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | require ("gslcore");
_gslcore_import_module ("gslmatrix", current_namespace());
provide ("gslmatrix");
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