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2 Commits

Author SHA1 Message Date
John McCall
565198ebe3 Default actors carry a null witness-table pointer in Builtin.Executor. 
Previously, they were storing a low-bit flag that indicated that they
were a default actor.  Using an extra inhabitant frees up the low bit
for future use without being conspicuously more expensive to check.
 2021-04-30 03:11:56 -04:00
John McCall
ec5215bf4f Remove the implicit nil inhabitant of Builtin.Executor, 
and traffic in Optional<Builtin.Executor> in various places.
 2021-04-30 03:11:56 -04:00