A recent change (I think possibly https://bugs.webkit.org/show_bug.cgi?id=247452) changed error messages to be more helpful, which has caused some typed funcref tests to fail. The error strings need to be checked & updated.
Pull request: https://github.com/WebKit/WebKit/pull/6353
Committed 256540@main (6b2451da7856): <https://commits.webkit.org/256540@main> Reviewed commits have been landed. Closing PR #6353 and removing active labels.
<rdar://problem/102200889>