rust-index: avoid some cloning in find_gca_candidates() Instead of keeping the information whether the current revision is poisoned on `current_seen`, we extract it as a boolean. This also allows us to simplify the explanation of `seen[r].is_poisoned()`, as the exceptional case where it is poisoned right after `r` has been determined to be a solution does no longer exist.

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{

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    "conduit_uri": "https://phab.mercurial-scm.org/api",

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    "phabricator.uri": "https://phab.mercurial-scm.org/",

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    "repository.callsign": "HG",

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    "arc.land.onto.default": "@",

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    "base": "hg:.^"

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}