fix parsing of isolated
as an argument label
#38422
Merged
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With the introduction of
isolated
asa type modifier for actor types, the
parsing of a parameter regressed such
that
isolated
was no longer acceptedas an ordinary argument label. This patch
fixes that and adds a little lookahead
utility to clean-up the code that
disambiguates the uses of
isolated
as either a label or a type modifier.
Resolves rdar://80300022