fn find_candidate(
cx: &ResolverContext,
backtrack_stack: &mut Vec<BacktrackFrame>,
parent: &Summary,
backtracked: bool,
conflicting_activations: &BTreeMap<PackageId, ConflictReason>,
) -> Option<(Summary, bool, BacktrackFrame)>Expand description
Looks through the states in backtrack_stack for dependencies with
remaining candidates. For each one, also checks if rolling back
could change the outcome of the failed resolution that caused backtracking
in the first place. Namely, if we’ve backtracked past the parent of the
failed dep, or any of the packages flagged as giving us trouble in
conflicting_activations.
Read https://github.com/rust-lang/cargo/pull/4834 For several more detailed explanations of the logic here.