Slava Pestov e7d7f6f69f RequirementMachine: Add Copyable/Escapable requirements to 'placeholder' generic signatures ...

If we fail to build a generic signature (or requirement signature of a
protocol) because of a request cycle or because Knuth-Bendix completion
failed, we would create a placeholder signature with no requirements.

However in a move-only world, a completely unconstrained generic
parameter might generate spurious diagnostics when used in a copyable
way. For this reason, let's outfit these placeholder signatures with
a default set of conformance requirements to Copyable and Escapable.

2024-02-20 18:26:05 -05:00

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