HeaderRetrievalFn

	Source (upstream pre-purge)	Current
File	eth/fetcher/block_fetcher.go	block_fetcher_pow.go
Symbol	HeaderRetrievalFn	HeaderRetrievalFn
Ref	f4d53133f~1	etc/v1.17.3-full-node

3-way merge — purge → getc ← upstream

pre-purge

↗// HeaderRetrievalFn is a callback type for retrieving a header from the local chain.

type HeaderRetrievalFn func(common.Hash) *types.Header

core-geth validation — **Identical** ✅

| | | |---|---| | File | [`block_fetcher.go`](https://github.com/etclabscore/core-geth/blob/v1.12.20/eth/fetcher/block_fetcher.go) | | Symbol | `HeaderRetrievalFn` | | Ref | `v1.12.20` |

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