bug#43651: 27.1; compile.el should not parse its own header for errors

[Lars Ingebrigtsen]

David Landell <david.landell@sunnyhill.email> writes:

> I am attaching a patch that superficially seems to fix these issues.
> I have a hard time judging if this fix has any bad side effects or
> similar though.

Thanks for the analysis -- your patch was basically correct, I think,
but a bit brittle.  Instead of doing the marking with a variable, I've
now made compile mark the end of the header with a text property, and
that's then used to find the end of the header when pasing.

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