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Simplify some Option / Result / ? operator patterns (#8653)

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* Simplify some Option / Result / ? operator patterns

When those match a combinator exactly.

Tool-aided by [comby-rust](https://github.com/huitseeker/comby-rust).

* adjust after review

* adjust post-review
This commit is contained in:
François Garillot
2021-04-23 09:36:10 -04:00
committed by GitHub
parent 541692c4a8
commit 052be8bbef
37 changed files with 77 additions and 188 deletions
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substrate/client/db/src/changes_tries_storage.rs
+2 -4
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@@ -503,10 +503,8 @@ fn read_tries_meta<Block: BlockT>(
meta_column: u32,
) -> ClientResult<ChangesTriesMeta<Block>> {
match db.get(meta_column, meta_keys::CHANGES_TRIES_META) {
Some(h) => match Decode::decode(&mut &h[..]) {
Ok(h) => Ok(h),
Err(err) => Err(ClientError::Backend(format!("Error decoding changes tries metadata: {}", err))),
},
Some(h) => Decode::decode(&mut &h[..])
.map_err(|err| ClientError::Backend(format!("Error decoding changes tries metadata: {}", err))),
None => Ok(ChangesTriesMeta {
oldest_digest_range: None,
oldest_pruned_digest_range_end: Zero::zero(),