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6a9875c73e
A mutable capture is always escaping. Naturally, you can't mutably capture a non-Escapable value. Nonetheless, code may override the lifetime of the captured value as immortal, knowing that the closure does not actually escape. '_overrideLifetime(capturedThing, copying: ())' quiets the diagnostics on the caller side. But, when diagnosing the closure body itself, lifetime analysis is upset by the boxed non-Escaping value. Simply add a case to LocalVariableAccessMap to recognize this as a valid case so that diagnostics can ignore it. Fixes rdar://170592353 (error: lifetime-dependent variable 'overriddenLifetime' escapes its scope)