allow more module declaration formats in module check

[IanButterworth]

Motivated by #51635 (comment)

[fatteneder]

I wonder if using Meta.parse(extfile) and subsequent scanning of the AST would give an even more robust solution?

[KristofferC]

Seems like this doesn't fully work.

[IanButterworth]

I wonder if using Meta.parse(extfile) and subsequent scanning of the AST would give an even more robust solution?

@fatteneder the reason I didn't do that is this is supposed to be very efficient in valid files, so it returns early. I think Meta.parse would do more work in most cases