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Robert Habermeier 956bc300c1 Approval voting guide changes (#2347)
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# Candidate Events
Yields a vector of events concerning candidates that occurred within the given block.
```rust
enum CandidateEvent {
/// This candidate receipt was backed in the most recent block.
CandidateBacked(CandidateReceipt, HeadData, CoreIndex, GroupIndex),
/// This candidate receipt was included and became a parablock at the most recent block.
CandidateIncluded(CandidateReceipt, HeadData, CoreIndex, GroupIndex),
/// This candidate receipt was not made available in time and timed out.
CandidateTimedOut(CandidateReceipt, HeadData, CoreIndex),
}
fn candidate_events(at: Block) -> Vec<CandidateEvent>;
```