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Simon Marlow authored
Optimisation: the update code only needs to check whether the closure being updated is a BLACKHOLE_BQ if it has been blackholed; which is only the case after lazy blackholing has taken place. So to avoid this unnecessary cost, we have two kinds of update frame: one which checks for BLACKHOLE_BQ and one that doesn't, and the lazy blackholing algorithm converts the latter kind into the former as it replaces thunks with blackholes.
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