>  >> The real question is why check_function_bodies doesn't cover this;
>  >> there's a comment in fmgr_c_validator that this is deliberate, but it's
>  >> rather unclear what the advantage is supposed to be:
>  Tom> Error detection, ie did you spell the C symbol name correctly.
> Right, but surely restoring a dump is not the place to be doing that
> error check?

Similar check also happens on pg_upgrade in link mode. It would be more
useful to get it to attempt to upgrade the extension if there is absent
function or absent library error.

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