bug#43678: 27.1; compiler warning if code forgets to require cl-lib

[Lars Ingebrigtsen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> I'm not sure what would be a good error message.
> Maybe something like "`cl-progv` defined too late"?

Or perhaps

"`cl-progv` defined too late (missing `require' of a library file?)"

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