Allow pallet error enum variants to contain fields (#10242)

* Allow pallet errors to contain at most one field

* Update docs on pallet::error

* Reword documentation

* cargo fmt

* Introduce CompactPalletError trait and require #[pallet::error] fields to implement them

* cargo fmt

* Do not assume tuple variants

* Add CompactPalletError derive macro

* Check for error type compactness in construct_runtime

* cargo fmt

* Derive CompactPalletError instead of implementing it directly during macro expansion

* Implement CompactPalletError on OptionBool instead of Option<bool>

* Check for type idents instead of variant ident

* Add doc comments for ErrorCompactnessTest

* Add an trait implementation of ErrorCompactnessTest for ()

* Convert the error field of DispatchError to a 4-element byte array

* Add static check for pallet error size

* Rename to MAX_PALLET_ERROR_ENCODED_SIZE

* Remove ErrorCompactnessTest trait

* Remove check_compactness

* Return only the most significant byte when constructing a custom InvalidTransaction

* Rename CompactPalletError to PalletError

* Use counter to generate unique idents for assert macros

* Make declarative pallet macros compile with pallet error size checks

* Remove unused doc comment

* Try and fix build errors

* Fix build errors

* Add macro_use for some test modules

* Test fix

* Fix compilation errors

* Remove unneeded #[macro_use]

* Resolve import ambiguity

* Make path to pallet Error enum more specific

* Fix test expectation

* Disambiguate imports

* Fix test expectations

* Revert appending pallet module name to path

* Rename bags_list::list::Error to BagError

* Fixes

* Fixes

* Fixes

* Fix test expectations

* Fix test expectation

* Add more implementations for PalletError

* Lift the 1-field requirement for nested pallet errors

* Fix UI test expectation

* Remove PalletError impl for OptionBool

* Use saturating operations

* cargo fmt

* Delete obsolete test

* Fix test expectation

* Try and use assert macro in const context

* Pull out the pallet error size check macro

* Fix UI test for const assertion

* cargo fmt

* Apply clippy suggestion

* Fix doc comment

* Docs for create_tt_return_macro

* Ensure TryInto is imported in earlier Rust editions

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Fix up comments and names

* Implement PalletError for Never

* cargo fmt

* Don't compile example code

* Bump API version for block builder

* Factor in codec attributes while derving PalletError

* Rename module and fix unit test

* Add missing attribute

* Check API version and convert ApplyExtrinsicResult accordingly

* Rename BagError to ListError

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Use codec crate re-exported from frame support

* Add links to types mentioned in doc comments

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* cargo fmt

* cargo fmt

* Re-add attribute for hidden docs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

substrate/client/rpc/src/state/tests.rs

@@ -527,7 +527,7 @@ fn should_return_runtime_version() {
 
 	let result = "{\"specName\":\"test\",\"implName\":\"parity-test\",\"authoringVersion\":1,\
 		\"specVersion\":2,\"implVersion\":2,\"apis\":[[\"0xdf6acb689907609b\",4],\
-		[\"0x37e397fc7c91f5e4\",1],[\"0xd2bc9897eed08f15\",3],[\"0x40fe3ad401f8959a\",5],\
+		[\"0x37e397fc7c91f5e4\",1],[\"0xd2bc9897eed08f15\",3],[\"0x40fe3ad401f8959a\",6],\
 		[\"0xc6e9a76309f39b09\",1],[\"0xdd718d5cc53262d4\",1],[\"0xcbca25e39f142387\",2],\
 		[\"0xf78b278be53f454c\",2],[\"0xab3c0572291feb8b\",1],[\"0xbc9d89904f5b923f\",1]],\
 		\"transactionVersion\":1,\"stateVersion\":1}";