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Malte Ubl
8d7f23ae76
A generator frame owns its parameters until its final exit, across every suspension, so an unchanged, unboxed reference parameter is a stable owner that reads may borrow (CallLifetimes.generatorParameters). Calling a callback parameter on every step no longer retains and releases it. Generator declarations entered only through direct (spawn) calls are now constant-callback consumers: when every call passes the same function, the body enters it through the guarded direct path, which inlines it and drops the dynamic-`this` bracket for callees that cannot observe it.