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Use proc macros to generate conversion functions for MultiLocation #3635

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Aug 19, 2021

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KiChjang
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This PR is a refactoring of the large chunk of manual and boilerplate code that we wrote just to convert MultiLocation from different kinds of types -- it's now substituted by a proc macro named impl_conversion_functions_for_multilocatiion_v1!().

@KiChjang KiChjang added A0-please_review Pull request needs code review. B0-silent Changes should not be mentioned in any release notes C1-low PR touches the given topic and has a low impact on builders. D3-trivial 🧸 PR contains trivial changes in a runtime directory that do not require an audit. labels Aug 13, 2021
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Could we also add some examples and/or compile time tests?
like
let multi: MultiLocation = [Parachain(1234), GeneralIndex(42)].into();

xcm/procedural/src/multilocation.rs Outdated Show resolved Hide resolved
xcm/procedural/src/multilocation.rs Outdated Show resolved Hide resolved
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Nice. +1 for the tests :-)

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Looks correct to me, but best if someone else also takes a look and approve before merge

@shawntabrizi
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bot merge

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ghost commented Aug 19, 2021

Trying merge.

@ghost ghost merged commit a2a4cba into master Aug 19, 2021
@ghost ghost deleted the kckyeung/xcm-proc-macros branch August 19, 2021 09:24
@chevdor chevdor mentioned this pull request Sep 2, 2021
chevdor pushed a commit that referenced this pull request Sep 2, 2021
…3635)

* Use proc macros to generate conversion functions for MultiLocation

* Add compile test and missing conversion cases

* Add common derives for Parent and Ancestor

* Generate conversion functions for MultiLocation v0 via proc macro

* Add type conversion test and fix a bug

* cargo fmt

* Do not hardcode 8 as the number of max parents

* Use map instead of for loops when generating code fragments

* Spelling

* cargo fmt

* More mapping, less for-looping
chevdor pushed a commit that referenced this pull request Sep 10, 2021
…3635)

* Use proc macros to generate conversion functions for MultiLocation

* Add compile test and missing conversion cases

* Add common derives for Parent and Ancestor

* Generate conversion functions for MultiLocation v0 via proc macro

* Add type conversion test and fix a bug

* cargo fmt

* Do not hardcode 8 as the number of max parents

* Use map instead of for loops when generating code fragments

* Spelling

* cargo fmt

* More mapping, less for-looping
chevdor pushed a commit that referenced this pull request Sep 11, 2021
…3635)

* Use proc macros to generate conversion functions for MultiLocation

* Add compile test and missing conversion cases

* Add common derives for Parent and Ancestor

* Generate conversion functions for MultiLocation v0 via proc macro

* Add type conversion test and fix a bug

* cargo fmt

* Do not hardcode 8 as the number of max parents

* Use map instead of for loops when generating code fragments

* Spelling

* cargo fmt

* More mapping, less for-looping
chevdor pushed a commit that referenced this pull request Sep 13, 2021
…3635)

* Use proc macros to generate conversion functions for MultiLocation

* Add compile test and missing conversion cases

* Add common derives for Parent and Ancestor

* Generate conversion functions for MultiLocation v0 via proc macro

* Add type conversion test and fix a bug

* cargo fmt

* Do not hardcode 8 as the number of max parents

* Use map instead of for loops when generating code fragments

* Spelling

* cargo fmt

* More mapping, less for-looping
s3krit pushed a commit that referenced this pull request Sep 15, 2021
* Companion for substrate/pull/9442 (#3594)

* Fix compact build

* Fix again

* fix staking miner

* fmt

* update Substrate

Co-authored-by: parity-processbot <>

* More standard staking miner deposits (#3621)

* XCM v1 (#2815)

* MultiAsset TWO

* Draft next MultiAsset API.

* XCM core builds

* XCM Executor builds

* XCM Builder builds

* API changes making their way throughout

* Some TODOs

* Further build fixes

* Basic compile builds

* First test fixed

* All executor tests fixed

* Typo

* Optimize subsume_assets and add test

* Optimize checked_sub

* XCM Builder first test fixed

* Fix builder tests

* Fix doc test

* fix some doc tests

* spelling

* named fields for AllOf

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Reformat

* Move to XCM version 1

* Spelling

* warnings

* Replace some more v0->v1s

* warnings

* format

* Add max_assets param

* building

* test fixes

* tests

* another test

* final test

* tests

* Rename Null -> Here

* Introduce

* More ergonomics

* More ergonomics

* test fix

* test fixes

* docs

* BuyExecution includes

* Fix XCM extrinsics

* fmt

* Make Vec<MultiAsset>/MultiAssets conversions safe

* More MultiAssets conversion safety

* spelling

* fix doc test

* Apply suggestions from code review

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* Apply suggestions from code review

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* fmt

* Add v0, remove VersionedMultiAsset

* Remove VersionedMultiLocation

* Update xcm/src/v1/order.rs

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* Update xcm/src/v1/mod.rs

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* XCM v0 backwards compatibility

* Full compatibility

* fmt

* Update xcm/pallet-xcm/src/lib.rs

* Update xcm/src/v0/order.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Tweaks to versioning system

* Fixes

* fmt

* Update xcm/xcm-executor/src/assets.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update xcm/xcm-executor/src/assets.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Grumbles

* Update xcm/src/v1/multiasset.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* fmt

* Update xcm/src/v1/multiasset.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update xcm/src/v1/multiasset.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Fixes

* Formatting

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
Co-authored-by: Amar Singh <asinghchrony@protonmail.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* XCM v1 (#2815)

* MultiAsset TWO

* Draft next MultiAsset API.

* XCM core builds

* XCM Executor builds

* XCM Builder builds

* API changes making their way throughout

* Some TODOs

* Further build fixes

* Basic compile builds

* First test fixed

* All executor tests fixed

* Typo

* Optimize subsume_assets and add test

* Optimize checked_sub

* XCM Builder first test fixed

* Fix builder tests

* Fix doc test

* fix some doc tests

* spelling

* named fields for AllOf

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Reformat

* Move to XCM version 1

* Spelling

* warnings

* Replace some more v0->v1s

* warnings

* format

* Add max_assets param

* building

* test fixes

* tests

* another test

* final test

* tests

* Rename Null -> Here

* Introduce

* More ergonomics

* More ergonomics

* test fix

* test fixes

* docs

* BuyExecution includes

* Fix XCM extrinsics

* fmt

* Make Vec<MultiAsset>/MultiAssets conversions safe

* More MultiAssets conversion safety

* spelling

* fix doc test

* Apply suggestions from code review

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* Apply suggestions from code review

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* fmt

* Add v0, remove VersionedMultiAsset

* Remove VersionedMultiLocation

* Update xcm/src/v1/order.rs

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* Update xcm/src/v1/mod.rs

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* XCM v0 backwards compatibility

* Full compatibility

* fmt

* Update xcm/pallet-xcm/src/lib.rs

* Update xcm/src/v0/order.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Tweaks to versioning system

* Fixes

* fmt

* Update xcm/xcm-executor/src/assets.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update xcm/xcm-executor/src/assets.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Grumbles

* Update xcm/src/v1/multiasset.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* fmt

* Update xcm/src/v1/multiasset.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update xcm/src/v1/multiasset.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Fixes

* Formatting

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
Co-authored-by: Amar Singh <asinghchrony@protonmail.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Companion to #9514 (Remove Filter and use Contains instead) (#3591)

* Remove Filter and use Contains instead

* Fixes

* Remove patch

* Formatting

* update Substrate

Co-authored-by: parity-processbot <>

* Fix Backwards Compatability with v0 Response (#3597)

* fix junction + response

* Update xcm/src/v1/mod.rs

* better comment

* Minor fix to encoding for XCM v1 (#3602)

* Ensure MultiLocation always has a canonical representation (#3404)

* MultiAsset TWO

* Ensure MultiLocation always has a canonical representation

* Remove v1 module

* Draft next MultiAsset API.

* Implement custom encoding/decoding scheme for MultiLocation

* Properly implement IntoIterator for Junctions

* Implement TryFrom<MultiLocation> for Junctions

* Fix spelling mistakes

* Fix tests in xcm-executor

* XCM core builds

* XCM Executor builds

* XCM Builder builds

* Fix xcm-builder tests and compilation

* Make pallet-xcm compile

* Use MultiLocation::default()

* Make polkadot-runtime-common compile

* Make rococo-runtime compile

* Change return type of parent_count to u8

* Change MAX_MULTILOCATION_LENGTH to 255

* Make kusama-runtime compile

* Fix logic in pallet-xcm

* Use MultiLocation::empty()

* Fix logic in location_conversion

* Fix logic in origin_conversion.rs

* Make westend-runtime compile

* Rename prefixes and suffixes variables

* Rename non_parent to interior

* Rename non_parent to interior

* Add test for encode/decode roundtrip and fix decode algorithm

* API changes making their way throughout

* Some TODOs

* Further build fixes

* Rename non_parent/junctions to interior

* Basic compile builds

* First test fixed

* All executor tests fixed

* Typo

* Optimize subsume_assets and add test

* Optimize checked_sub

* XCM Builder first test fixed

* Fix builder tests

* Fix doc test

* Make xcm-simulator compile

* Make xcm-simulator-example compile

* Make spellcheck happy

* cargo fmt

* fix some doc tests

* spelling

* named fields for AllOf

* Fix subtle bug where Null is treated as an identifier

* Add FIXME comment awaiting for const generics eval stabilization

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/src/v0/multiasset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Reformat

* Move to XCM version 1

* Spelling

* warnings

* Replace some more v0->v1s

* warnings

* format

* Add max_assets param

* building

* test fixes

* tests

* another test

* final test

* Update rustdocs and add debug_assert where sensible

* Revert debug_assert in const fn len()

* tests

* Rename Null -> Here

* Introduce

* More ergonomics

* More ergonomics

* test fix

* test fixes

* docs

* BuyExecution includes

* Fix XCM extrinsics

* fmt

* Make Vec<MultiAsset>/MultiAssets conversions safe

* More MultiAssets conversion safety

* spelling

* fix doc test

* Apply suggestions from code review

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* Apply suggestions from code review

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* fmt

* Add v0, remove VersionedMultiAsset

* Remove VersionedMultiLocation

* Update xcm/src/v1/order.rs

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* Update xcm/src/v1/mod.rs

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* XCM v0 backwards compatibility

* Full compatibility

* fmt

* Update xcm/pallet-xcm/src/lib.rs

* Update xcm/src/v0/order.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Tweaks to versioning system

* Fixes

* fmt

* Fix pallet-xcm tests

* fix

* Substitute with_parent with with_parents_const

* Rename argument name from a to m

* Rename split_last to split_last_interior

* Allow adding multiple parents in MultiLocation

* Rename pop_parent to dec_parent

* Ensure relay chain XCM sender receives a MultiLocation without any parents

* Block only when MultiLocation destination length is 8

* Cargo fmt

* Remove reverse iterators, implement DoubleEndedIterator and add tests

* Fix iter_rev lifetime requirements

* Cargo fmt

* Add an into() method for Junctions for conciseness in const context

* Ensure parent count is 0 while executing who in RelayedFrom

* Appease spellchecker

* Use and_then instead of repeated map_err

* Remove custom codec indices for v1 Junctions

* Add convenience 'contains_parents_only' method to MultiLocation

* Fix merge conflict

* Use more convenience methods

* Remove with_parachain_interior

* Prefer matching against tuple instead of using match guards

* Match against tuple instead of using more match guards

* Update encode/decode test for MultiLocation

* Minor tweaks

* Fixes

* Fixes

* Fixes

* Fix MultiLocation

* Add deprecation note for iter_rev and into_iter_rev

* Update some rustdocs

* cargo fmt

* Fix xcm-executor unit tests

* Fix compilation and unit tests in xcm-builder

* cargo fmt

* Fix tests in xcm-simulator-example

* Publicize MultiLocation fields

* Match on the MultiLocation struct directly in xcm-builder

* Do not dereference undereferenceable types

* Add convenience MultiLocation conversions for tuples

* Use clearer import paths

* Remove unused dependency

* fix junction + response

* Import from latest opaque xcm module

* Update xcm/src/v1/mod.rs

* better comment

* Fix ownership transfer

* Fix merge

* Fix merge

* cargo fmt

* Fix merge

* Fix merge

* Fix integration test

* More readable Parent syntax

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* cargo fmt

* Fixes

* Fix doc test

Co-authored-by: Gav Wood <gavin@parity.io>
Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
Co-authored-by: Amar Singh <asinghchrony@protonmail.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Make RelayedFrom typesafe (#3617)

* Corrent type

* Fix build

* Fixes

* Fixes

* Formatting

* Remove BuyExecution::orders (#3640)

* Remove BuyExecution::orders

* Fixes

* Fixes

* Fixes

* Formatting

* XCM: Introduce versioning to dispatchables' params (#3693)

* Introduce versioning to dispatchables' params

* Fixes

* Formatting

* Bump

* Bump deps

* Fixes

* Fixes

* check runtime version in staking miner (#3628)

* check runtime version in staking miner

* fmt

* add short alias for things

* fix fee

* print length as well

* fix build

* review comments

* add integration tests to xcm-builder (#3537)

* add integration tests to xcm-builder

* add an integration test for reserve_transfer_assets

* add query holding and teleport tests

* formatting

* add to barrier doc comments and fix doc tests warnings

* use more realistic barrier for integration tests

* improve imports

* adjust base xcm weight and existential deposit to be in line with Kusama

* remove AnyNetwork

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* add more comments and remove unnecessary code

* move mock into separate file

* reduce imports

* update cargo.lock

* remove reserve transfer test from xcm builder integration tests

* reword barrier doc comment

* elaborate on QueryHolding test scenario

* add an integration test for reserve based transfers from parachain to parachain

* add teleport tests

* fix failing teleport filter tests

* Update xcm/xcm-builder/src/integration_tests.rs

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

* Update xcm/xcm-builder/src/integration_tests.rs

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

* Update xcm/xcm-builder/src/integration_tests.rs

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

* Move integration tests to tests/ directory

* Fix merge

* Replace All wildcard with a concrete seed amount

* Rename SEED_AMOUNT to REGISTER_AMOUNT

* Fix compilation error

* Check for teleport destination first before checking out assets

* Fix unit test

* Do not run tests in integration mock

* Add a permissive assets filter for teleportation

* Remove check for teleport location in InitiateTeleport XCM

* Remove defunct test

* Apply suggestions from code review

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

* Reword comment

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>

* Impl WeightTrader for tuple (#3601)

* Impl WeightTrader for tuple.

* fmt

* Renaming.

* add tracing for buy_weight

* Add comment clarifying the default behavior of a WeightTrader tuple

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>

* fix compilation (#3657)

* Use proc macros to generate conversion functions for MultiLocation (#3635)

* Use proc macros to generate conversion functions for MultiLocation

* Add compile test and missing conversion cases

* Add common derives for Parent and Ancestor

* Generate conversion functions for MultiLocation v0 via proc macro

* Add type conversion test and fix a bug

* cargo fmt

* Do not hardcode 8 as the number of max parents

* Use map instead of for loops when generating code fragments

* Spelling

* cargo fmt

* More mapping, less for-looping

* Improve MultiLocation conversion functions in xcm-procedural (#3690)

* Use fully-qualified paths to reference core traits in proc macro

* Ensure a canonicalized v0 MultiLocation first before attempting to convert to v1

* Fix failing test

* XCM v1 version notification stub (#3766)

* Initial draft

* v1 subscriptions

* Fixes

* Fixes

* Formatting

* Fixes

* Formatting

* chore: update substrate to branch polkadot-v0.9.10

* chore: update beefy to branch polkadot-v0.9.10

* Provide dummy dispute coordinator by default. (#3661)

* Provide dummy dispute coordinator by default.

* cargo fmt

* Fill up requests slots via `launch_parallel_requests` (#3681)

in case waiting for the next response takes too long.

* Fix missing overseer feature

* Update beefy deps

* xcm executor version bump

* Remove request multiplexer (#3624)

* WIP: Get rid of request multiplexer.

* WIP

* Receiver for handling of incoming requests.

* Get rid of useless `Fault` abstraction.

The things the type system let us do are not worth getting abstracted in
its own type. Instead error handling is going to be merely a pattern.

* Make most things compile again.

* Port availability distribution away from request multiplexer.

* Formatting.

* Port dispute distribution over.

* Fixup statement distribution.

* Handle request directly in collator protocol.

+ Only allow fatal errors at top level.

* Use direct request channel for availability recovery.

* Finally get rid of request multiplexer

Fixes #2842 and paves the way for more back pressure possibilities.

* Fix overseer and statement distribution tests.

* Fix collator protocol and network bridge tests.

* Fix tests in availability recovery.

* Fix availability distribution tests.

* Fix dispute distribution tests.

* Add missing dependency

* Typos.

* Review remarks.

* More remarks.

* Add words to the dictionnary

* sp-io update

* Don't drop UMP queue items if weight exhausted (#3784)

* Requeue UMP queue items if weight exhausted

* Reduce complexity and remove Deque

* Formatting

* Formatting

* Avoid needless storage writes

* Test

* Formatting

* Docs and cleanup

* fmt

* Remove now irrelevant comment.

* Simplify `take_processed` by using `mem::take`

* Clean up & fmt: use `upward_message` directly.

* Grumbles

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Sergei Shulepov <sergei@parity.io>

* Update beefy deps

* Update Substrate and Beefy

* fix for #3537

* Update substrate

* Fix spelling

* Do not expire HRMP open channel requests (#3543)

* Do not expire HRMP open channel requests

* Fix the build and update the docs

* Implement canceling requests and do not remove them automatically

* Fix a borked merge

* Fix fmt

* Please spellchecker

* Apply suggestions from code review

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* Use `mutate_exists` for maintaining request counts

* Apply `rustfmt`

* Move newly introduced entrypoint to end to preserve ordering

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* UMP: Support Overweight messages (#3575)

* Introduce new config: ump_max_individual_weight

* Implement overweight msg stashing

* Test

* Add migration module.

Also introduces a test for migration

* Integrate ExecuteOverweightOrigin to runtimes

* Fix more stuff

* Add `yeet` into dictionary

* Use suggested `Error` variant names

* typo

* Use 20ms as the maximum individual message weight

* Update the test value

* rustfmt

* Clean up

* Remove deprecated field from host config

* Remove missed _hrmp_open_request_ttl

* Apply typo fix suggestion

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Rename `migration::migrate_to_latest`

* Restore `_hrmp_open_request_ttl` in `v0::HostConfiguration`

* Apply suggestion for a rustdoc

* Apply the suggestion

* Test v0 config with the raw production data fetched from Kusama

* Update runtime/parachains/src/ump.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Expose migration functions

* Fix spellcheck

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>

* Remove migration done by runtime version 9090 (#3731)

* remove 9090 migrations

* remove unused

* fmt

* revert removal of polkadot migration

* remove migration for polkadot

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Gavin Wood <gavin@parity.io>
Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
Co-authored-by: Amar Singh <asinghchrony@protonmail.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>
Co-authored-by: Shaun Wang <spxwang@gmail.com>
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Robert Klotzner <eskimor@users.noreply.github.com>
Co-authored-by: Sergei Shulepov <sergei@parity.io>
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