Somehow bypass issue that causes LTA error of R#2640
Somehow bypass issue that causes LTA error of R#2640

Not sure why this makes a difference at all, but by replacing the
    when Failure
by a much more low level
    if nqp::istype(Failure)
we at least get a decent error message.  I assume this is somehow related
to $_ scoping optimizations that have happened.

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