Get list of args from closures

[matsl]

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What

Get list of args from closures.

Why

Closures needs to be identified in order for unit tests to work on Emacs with native compilation. This makes "make test" and "make test-all" work for native compiled code.

Note

The current CI setup does not trigger this since the docker images does not have native compilation.

There could be more places to look for this type of changes. It does only fix the code to run the unit tests.