lib.rs

/// 	...
/// }
/// ```
///
/// I.e. an enum (with named or unnamed fields variant), named `Event`, with generic: none or
/// `T` or `T: Config`, and optional w here clause.
///
/// Each field must implement [`Clone`], [`Eq`], [`PartialEq`], [`Encode`], [`Decode`], and
/// [`Debug`] (on std only). For ease of use, bound by the trait
/// [`Member`](`frame_support::pallet_prelude::Member`), available in
/// frame_support::pallet_prelude.
///
/// Also see [`pallet::event`](`frame_support::pallet_macros::event`)
///
/// ## `#[pallet::generate_deposit($visibility fn deposit_event)]`
///
/// The attribute `#[pallet::generate_deposit($visibility fn deposit_event)]` generates a
/// helper function on `Pallet` that handles deposit events.
///
/// NOTE: For instantiable pallets, the event must be generic over `T` and `I`.
///
/// Also see [`pallet::generate_deposit`](`frame_support::pallet_macros::generate_deposit`)
///
/// # Storage: `#[pallet::storage]` (optional)
///
/// The `#[pallet::storage]` attribute lets you define some abstract storage inside of runtime
/// storage and also set its metadata. This attribute can be used multiple times.
///
/// Item should be defined as:
///
/// ```ignore
/// #[pallet::storage]
/// #[pallet::getter(fn $getter_name)] // optional
/// $vis type $StorageName<$some_generic> $optional_where_clause
/// 	= $StorageType<$generic_name = $some_generics, $other_name = $some_other, ...>;
/// ```
///
/// or with unnamed generic:
///
/// ```ignore
/// #[pallet::storage]
/// #[pallet::getter(fn $getter_name)] // optional
/// $vis type $StorageName<$some_generic> $optional_where_clause
/// 	= $StorageType<_, $some_generics, ...>;
/// ```
///
/// I.e. it must be a type alias, with generics: `T` or `T: Config`. The aliased type must be
/// one of [`StorageValue`](`pallet_prelude::StorageValue`),
/// [`StorageMap`](`pallet_prelude::StorageMap`) or
/// [`StorageDoubleMap`](`pallet_prelude::StorageDoubleMap`). The generic arguments of the
/// storage type can be given in two manners: named and unnamed. For named generic arguments,
/// the name for each argument should match the name defined for it on the storage struct:
/// * [`StorageValue`](`pallet_prelude::StorageValue`) expects `Value` and optionally
///   `QueryKind` and `OnEmpty`,
/// * [`StorageMap`](`pallet_prelude::StorageMap`) expects `Hasher`, `Key`, `Value` and
///   optionally `QueryKind` and `OnEmpty`,
/// * [`CountedStorageMap`](`pallet_prelude::CountedStorageMap`) expects `Hasher`, `Key`,
///   `Value` and optionally `QueryKind` and `OnEmpty`,
/// * [`StorageDoubleMap`](`pallet_prelude::StorageDoubleMap`) expects `Hasher1`, `Key1`,
///   `Hasher2`, `Key2`, `Value` and optionally `QueryKind` and `OnEmpty`.
///
/// For unnamed generic arguments: Their first generic must be `_` as it is replaced by the
/// macro and other generic must declared as a normal generic type declaration.
///
/// The `Prefix` generic written by the macro is generated using
/// `PalletInfo::name::<Pallet<..>>()` and the name of the storage type. E.g. if runtime names
/// the pallet "MyExample" then the storage `type Foo<T> = ...` should use the prefix:
/// `Twox128(b"MyExample") ++ Twox128(b"Foo")`.
///
/// For the [`CountedStorageMap`](`pallet_prelude::CountedStorageMap`) variant, the `Prefix`
/// also implements
/// [`CountedStorageMapInstance`](`frame_support::storage::types::CountedStorageMapInstance`).
/// It also associates a [`CounterPrefix`](`pallet_prelude::CounterPrefix'), which is
/// implemented the same as above, but the storage prefix is prepend with `"CounterFor"`. E.g.
/// if runtime names the pallet "MyExample" then the storage `type Foo<T> =
/// CountedStorageaMap<...>` will store its counter at the prefix: `Twox128(b"MyExample") ++
/// Twox128(b"CounterForFoo")`.
///
/// E.g:
///
/// ```ignore
/// #[pallet::storage]
/// pub(super) type MyStorage<T> = StorageMap<Hasher = Blake2_128Concat, Key = u32, Value = u32>;
/// ```
///
/// In this case the final prefix used by the map is `Twox128(b"MyExample") ++
/// Twox128(b"OtherName")`.
///
/// Also see [`pallet::storage`](`frame_support::pallet_macros::storage`)
///
/// ## `#[pallet::getter(fn $my_getter_fn_name)]` (optional)
///
/// The optional attribute `#[pallet::getter(fn $my_getter_fn_name)]` allows you to define a
/// getter function on `Pallet`.
///
/// Also see [`pallet::getter`](`frame_support::pallet_macros::getter`)
///
/// ## `#[pallet::storage_prefix = "SomeName"]` (optional)
///
/// The optional attribute `#[pallet::storage_prefix = "SomeName"]` allows you to define the
/// storage prefix to use, see how `Prefix` generic is implemented above. This is helpful if
/// you wish to rename the storage field but don't want to perform a migration.
///
/// E.g:
///
/// ```ignore
/// #[pallet::storage]
/// #[pallet::storage_prefix = "foo"]
/// #[pallet::getter(fn my_storage)]
/// pub(super) type MyStorage<T> = StorageMap<Hasher = Blake2_128Concat, Key = u32, Value = u32>;
/// ```
///
/// or
///
/// ```ignore
/// #[pallet::storage]
/// #[pallet::getter(fn my_storage)]
/// pub(super) type MyStorage<T> = StorageMap<_, Blake2_128Concat, u32, u32>;
/// ```
///
/// Also see [`pallet::storage_prefix`](`frame_support::pallet_macros::storage_prefix`)
///
/// ## `#[pallet::unbounded]` (optional)
///
/// The optional attribute `#[pallet::unbounded]` declares the storage as unbounded. When
/// implementating the storage info (when `#[pallet::generate_storage_info]` is specified on
/// the pallet struct placeholder), the size of the storage will be declared as unbounded. This
/// can be useful for storage which can never go into PoV (Proof of Validity).
///
/// Also see [`pallet::unbounded`](`frame_support::pallet_macros::unbounded`)
///
/// ## `#[pallet::whitelist_storage]` (optional)
///
/// The optional attribute `#[pallet::whitelist_storage]` will declare the storage as
/// whitelisted from benchmarking.
///
/// See
/// [`pallet::whitelist_storage`](frame_support::pallet_macros::whitelist_storage)
/// for more info.
///
///	## `#[cfg(..)]` (for storage)
/// The optional attributes `#[cfg(..)]` allow conditional compilation for the storage.
///
/// E.g:
///
/// ```ignore
/// #[cfg(feature = "my-feature")]
/// #[pallet::storage]
/// pub(super) type MyStorage<T> = StorageValue<Value = u32>;
/// ```
///
/// All the `cfg` attributes are automatically copied to the items generated for the storage,
/// i.e. the getter, storage prefix, and the metadata element etc.
///
/// Any type placed as the `QueryKind` parameter must implement
/// [`frame_support::storage::types::QueryKindTrait`]. There are 3 implementations of this
/// trait by default:
///
/// 1. [`OptionQuery`](`frame_support::storage::types::OptionQuery`), the default `QueryKind`
///    used when this type parameter is omitted. Specifying this as the `QueryKind` would cause
///    storage map APIs that return a `QueryKind` to instead return an [`Option`], returning
///    `Some` when a value does exist under a specified storage key, and `None` otherwise.
/// 2. [`ValueQuery`](`frame_support::storage::types::ValueQuery`) causes storage map APIs that
///    return a `QueryKind` to instead return the value type. In cases where a value does not
///    exist under a specified storage key, the `OnEmpty` type parameter on `QueryKindTrait` is
///    used to return an appropriate value.
/// 3. [`ResultQuery`](`frame_support::storage::types::ResultQuery`) causes storage map APIs
///    that return a `QueryKind` to instead return a `Result<T, E>`, with `T` being the value
///    type and `E` being the pallet error type specified by the `#[pallet::error]` attribute.
///    In cases where a value does not exist under a specified storage key, an `Err` with the
///    specified pallet error variant is returned.
///
/// NOTE: If the `QueryKind` generic parameter is still generic at this stage or is using some
/// type alias then the generation of the getter might fail. In this case the getter can be
/// implemented manually.
///
/// NOTE: The generic `Hasher` must implement the [`StorageHasher`] trait (or the type is not
/// usable at all). We use [`StorageHasher::METADATA`] for the metadata of the hasher of the
/// storage item. Thus generic hasher is supported.
///
/// ## Macro expansion
///
/// For each storage item the macro generates a struct named
/// `_GeneratedPrefixForStorage$NameOfStorage`, and implements
/// [`StorageInstance`](traits::StorageInstance) on it using the pallet and storage name. It
/// then uses it as the first generic of the aliased type. For
/// [`CountedStorageMap`](`pallet_prelude::CountedStorageMap`),
/// [`CountedStorageMapInstance`](`frame_support::storage::types::CountedStorageMapInstance`)
/// is implemented, and another similar struct is generated.
///
/// For a named generic, the macro will reorder the generics, and remove the names.
///
/// The macro implements the function `storage_metadata` on the `Pallet` implementing the
/// metadata for all storage items based on their kind:
/// * for a storage value, the type of the value is copied into the metadata
/// * for a storage map, the type of the values and the key's type is copied into the metadata
/// * for a storage double map, the type of the values, and the types of `key1` and `key2` are
///   copied into the metadata.
///
/// # Type value: `#[pallet::type_value]` (optional)
///
/// The `#[pallet::type_value]` attribute lets you define a struct implementing the
/// [`Get`](crate::traits::Get) trait to ease use of storage types. This attribute is meant to
/// be used alongside [`#[pallet::storage]`](#storage-palletstorage-optional) to define a
/// storage's default value. This attribute can be used multiple times.
///
/// Item must be defined as:
///
/// ```ignore
/// #[pallet::type_value]
/// fn $MyDefaultName<$some_generic>() -> $default_type $optional_where_clause { $expr }
/// ```
///
/// I.e.: a function definition with generics none or `T: Config` and a returned type.
///
/// E.g.:
///
/// ```ignore
/// #[pallet::type_value]
/// fn MyDefault<T: Config>() -> T::Balance { 3.into() }
/// ```
///
/// Also see [`pallet::type_value`](`frame_support::pallet_macros::type_value`)
///
/// # Genesis config: `#[pallet::genesis_config]` (optional)
///
/// The `#[pallet::genesis_config]` attribute allows you to define the genesis configuration
/// for the pallet.
///
/// Item is defined as either an enum or a struct. It needs to be public and implement the
/// trait [`GenesisBuild`](`traits::GenesisBuild`) with
/// [`#[pallet::genesis_build]`](#genesis-build-palletgenesis_build-optional). The type
/// generics are constrained to be either none, or `T` or `T: Config`.
///
/// E.g:
///
/// ```ignore
/// #[pallet::genesis_config]
/// pub struct GenesisConfig<T: Config> {
/// 	_myfield: BalanceOf<T>,
/// }
/// ```
///
/// Also see [`pallet::genesis_config`](`frame_support::pallet_macros::genesis_config`)
///
/// # Genesis build: `#[pallet::genesis_build]` (optional)
///
/// The `#[pallet::genesis_build]` attribute allows you to define how `genesis_configuration`
/// is built. This takes as input the `GenesisConfig` type (as `self`) and constructs the
/// pallet's initial state.
///
/// The impl must be defined as:
///
/// ```ignore
/// #[pallet::genesis_build]
/// impl<T: Config> GenesisBuild<T> for GenesisConfig<$maybe_generics> {
/// 	fn build(&self) { $expr }
/// }
/// ```
///
/// I.e. a trait implementation with generic `T: Config`, of trait `GenesisBuild<T>` on
/// type `GenesisConfig` with generics none or `T`.
///
/// E.g.:
///
/// ```ignore
/// #[pallet::genesis_build]
/// impl<T: Config> GenesisBuild<T> for GenesisConfig {
/// 	fn build(&self) {}
/// }
/// ```
///
/// Also see [`pallet::genesis_build`](`frame_support::pallet_macros::genesis_build`)
///
/// # Inherent: `#[pallet::inherent]` (optional)
///
/// The `#[pallet::inherent]` attribute allows the pallet to provide some
/// [inherent](https://docs.substrate.io/fundamentals/transaction-types/#inherent-transactions).
/// An inherent is some piece of data that is inserted by a block authoring node at block
/// creation time and can either be accepted or rejected by validators based on whether the
/// data falls within an acceptable range.
///
/// The most common inherent is the `timestamp` that is inserted into every block. Since there
/// is no way to validate timestamps, validators simply check that the timestamp reported by
/// the block authoring node falls within an acceptable range.
///
/// Item must be defined as:
///
/// ```ignore
/// #[pallet::inherent]
/// impl<T: Config> ProvideInherent for Pallet<T> {
/// 	// ... regular trait implementation
/// }
/// ```
///
/// I.e. a trait implementation with bound `T: Config`, of trait
/// [`ProvideInherent`](`pallet_prelude::ProvideInherent`) for type `Pallet<T>`, and some
/// optional where clause.
///
/// Also see [`pallet::inherent`](`frame_support::pallet_macros::inherent`)
///
/// # Validate unsigned: `#[pallet::validate_unsigned]` (optional)
///
/// The `#[pallet::validate_unsigned]` attribute allows the pallet to validate some unsigned
/// transaction:
///
/// Item must be defined as:
///
/// ```ignore
/// #[pallet::validate_unsigned]
/// impl<T: Config> ValidateUnsigned for Pallet<T> {
/// 	// ... regular trait implementation
/// }
/// ```
///
/// I.e. a trait implementation with bound `T: Config`, of trait
/// [`ValidateUnsigned`](`pallet_prelude::ValidateUnsigned`) for type `Pallet<T>`, and some
/// optional where clause.
///
/// NOTE: There is also the [`sp_runtime::traits::SignedExtension`] trait that can be used to
/// add some specific logic for transaction validation.
///
/// Also see [`pallet::validate_unsigned`](`frame_support::pallet_macros::validate_unsigned`)
///
/// # Origin: `#[pallet::origin]` (optional)
///
/// The `#[pallet::origin]` attribute allows you to define some origin for the pallet.
///
/// Item must be either a type alias, an enum, or a struct. It needs to be public.
///
/// E.g.:
///
/// ```ignore
/// #[pallet::origin]
/// pub struct Origin<T>(PhantomData<(T)>);
/// ```
///
/// **WARNING**: modifying origin changes the outer runtime origin. This outer runtime origin
/// can be stored on-chain (e.g. in `pallet-scheduler`), thus any change must be done with care
/// as it might require some migration.
///
/// NOTE: for instantiable pallets, the origin must be generic over `T` and `I`.
///
/// Also see [`pallet::origin`](`frame_support::pallet_macros::origin`)
///
/// # Composite enum `#[pallet::composite_enum]` (optional)
///
/// The `#[pallet::composite_enum]` attribute allows you to define an enum on the pallet which
/// will then instruct `construct_runtime` to amalgamate all similarly-named enums from other
/// pallets into an aggregate enum. This is similar in principle with how the aggregate enum is
/// generated for `#[pallet::event]` or `#[pallet::error]`.
///
/// The item tagged with `#[pallet::composite_enum]` MUST be an enum declaration, and can ONLY
/// be the following identifiers: `FreezeReason`, `HoldReason`, `LockId` or `SlashReason`.
/// Custom identifiers are not supported.
///
/// NOTE: For ease of usage, when no `#[derive]` attributes are detected, the
/// `#[pallet::composite_enum]` attribute will automatically derive the following traits for
/// the enum:
///
/// ```ignore
/// Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Encode, Decode, MaxEncodedLen, TypeInfo,
/// RuntimeDebug
/// ```
///
/// The inverse is also true: if there are any #[derive] attributes present for the enum, then
/// the attribute will not automatically derive any of the traits described above.
///
/// # General notes on instantiable pallets
///
/// An instantiable pallet is one where Config is generic, i.e. `Config<I>`. This allows
/// runtime to implement multiple instances of the pallet, by using different types for the
/// generic. This is the sole purpose of the generic `I`, but because
/// [`PalletInfo`](`traits::PalletInfo`) requires the `Pallet` placeholder to be static, it is
/// important to bound by `'static` whenever [`PalletInfo`](`traits::PalletInfo`) can be used.
/// Additionally, in order to make an instantiable pallet usable as a regular pallet without an
/// instance, it is important to bound by `= ()` on every type.
///
/// Thus impl bound looks like `impl<T: Config<I>, I: 'static>`, and types look like
/// `SomeType<T, I=()>` or `SomeType<T: Config<I>, I: 'static = ()>`.
///
/// # Example of a non-instantiable pallet
///
/// ```
/// pub use pallet::*; // reexport in crate namespace for `construct_runtime!`
///
/// #[frame_support::pallet]
/// // NOTE: The name of the pallet is provided by `construct_runtime` and is used as
/// // the unique identifier for the pallet's storage. It is not defined in the pallet itself.
/// pub mod pallet {
/// 	use frame_support::pallet_prelude::*; // Import various types used in the pallet definition
/// 	use frame_system::pallet_prelude::*; // Import some system helper types.
///
/// 	type BalanceOf<T> = <T as Config>::Balance;
///
/// 	// Define the generic parameter of the pallet
/// 	// The macro parses `#[pallet::constant]` attributes and uses them to generate metadata
/// 	// for the pallet's constants.
/// 	#[pallet::config]
/// 	pub trait Config: frame_system::Config {
/// 		#[pallet::constant] // put the constant in metadata
/// 		type MyGetParam: Get<u32>;
/// 		type Balance: Parameter + MaxEncodedLen + From<u8>;
/// 		type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;
/// 	}
///
/// 	// Define some additional constant to put into the constant metadata.
/// 	#[pallet::extra_constants]
/// 	impl<T: Config> Pallet<T> {
/// 		/// Some description
/// 		fn exra_constant_name() -> u128 { 4u128 }
/// 	}
///
/// 	// Define the pallet struct placeholder, various pallet function are implemented on it.
/// 	#[pallet::pallet]
/// 	#[pallet::generate_store(pub(super) trait Store)]
/// 	pub struct Pallet<T>(_);
///
/// 	// Implement the pallet hooks.
/// 	#[pallet::hooks]
/// 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {
/// 		fn on_initialize(_n: BlockNumberFor<T>) -> Weight {
/// 			unimplemented!();
/// 		}
///
/// 		// can implement also: on_finalize, on_runtime_upgrade, offchain_worker, ...
/// 		// see `Hooks` trait
/// 	}
///
/// 	// Declare Call struct and implement dispatchables.
/// 	//
/// 	// WARNING: Each parameter used in functions must implement: Clone, Debug, Eq, PartialEq,
/// 	// Codec.
/// 	//
/// 	// The macro parses `#[pallet::compact]` attributes on function arguments and implements
/// 	// the `Call` encoding/decoding accordingly.
/// 	#[pallet::call]
/// 	impl<T: Config> Pallet<T> {
/// 		/// Doc comment put in metadata
/// 		#[pallet::weight(0)] // Defines weight for call (function parameters are in scope)
/// 		pub fn toto(
/// 			origin: OriginFor<T>,
/// 			#[pallet::compact] _foo: u32,
/// 		) -> DispatchResultWithPostInfo {
/// 			let _ = origin;
/// 			unimplemented!();
/// 		}
/// 	}
///
/// 	// Declare the pallet `Error` enum (this is optional).
/// 	// The macro generates error metadata using the doc comment on each variant.
/// 	#[pallet::error]
/// 	pub enum Error<T> {
/// 		/// doc comment put into metadata
/// 		InsufficientProposersBalance,
/// 	}
///
/// 	// Declare pallet Event enum (this is optional).
/// 	//
/// 	// WARNING: Each type used in variants must implement: Clone, Debug, Eq, PartialEq, Codec.
/// 	//
/// 	// The macro generates event metadata, and derive Clone, Debug, Eq, PartialEq and Codec
/// 	#[pallet::event]
/// 	// Generate a funciton on Pallet to deposit an event.
/// 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
/// 	pub enum Event<T: Config> {
/// 		/// doc comment put in metadata
/// 		// `<T as frame_system::Config>::AccountId` is not defined in metadata list, the last
/// 		// Thus the metadata is `<T as frame_system::Config>::AccountId`.
/// 		Proposed(<T as frame_system::Config>::AccountId),
/// 		/// doc
/// 		// here metadata will be `Balance` as define in metadata list
/// 		Spending(BalanceOf<T>),
/// 		// here metadata will be `Other` as define in metadata list
/// 		Something(u32),
/// 	}
///
/// 	// Define a struct which implements `frame_support::traits::Get<T::Balance>` (optional).
/// 	#[pallet::type_value]
/// 	pub(super) fn MyDefault<T: Config>() -> T::Balance { 3.into() }
///
/// 	// Declare a storage item. Any amount of storage items can be declared (optional).
/// 	//
/// 	// Is expected either `StorageValue`, `StorageMap` or `StorageDoubleMap`.
/// 	// The macro generates the prefix type and replaces the first generic `_`.
/// 	//
/// 	// The macro expands the metadata for the storage item with the type used:
/// 	// * for a storage value the type of the value is copied into the metadata
/// 	// * for a storage map the type of the values and the type of the key is copied into the metadata
/// 	// * for a storage double map the types of the values and keys are copied into the
/// 	//   metadata.
/// 	//
/// 	// NOTE: The generic `Hasher` must implement the `StorageHasher` trait (or the type is not
/// 	// usable at all). We use [`StorageHasher::METADATA`] for the metadata of the hasher of the
/// 	// storage item. Thus generic hasher is supported.
/// 	#[pallet::storage]
/// 	pub(super) type MyStorageValue<T: Config> =
/// 		StorageValue<Value = T::Balance, QueryKind = ValueQuery, OnEmpty = MyDefault<T>>;
///
/// 	// Another storage declaration
/// 	#[pallet::storage]
/// 	#[pallet::getter(fn my_storage)]
/// 	#[pallet::storage_prefix = "SomeOtherName"]
/// 	pub(super) type MyStorage<T> =
/// 		StorageMap<Hasher = Blake2_128Concat, Key = u32, Value = u32>;
///
/// 	// Declare the genesis config (optional).
/// 	//
/// 	// The macro accepts either a struct or an enum; it checks that generics are consistent.
/// 	//
/// 	// Type must implement the `Default` trait.
/// 	#[pallet::genesis_config]
/// 	#[derive(Default)]
/// 	pub struct GenesisConfig {
/// 		_myfield: u32,
/// 	}
///
/// 	// Declare genesis builder. (This is need only if GenesisConfig is declared)
/// 	#[pallet::genesis_build]
/// 	impl<T: Config> GenesisBuild<T> for GenesisConfig {
/// 		fn build(&self) {}
/// 	}
///
/// 	// Declare a pallet origin (this is optional).
/// 	//
/// 	// The macro accept type alias or struct or enum, it checks generics are consistent.
/// 	#[pallet::origin]
/// 	pub struct Origin<T>(PhantomData<T>);
///
/// 	// Declare validate_unsigned implementation (this is optional).
/// 	#[pallet::validate_unsigned]
/// 	impl<T: Config> ValidateUnsigned for Pallet<T> {
/// 		type Call = Call<T>;
/// 		fn validate_unsigned(
/// 			source: TransactionSource,
/// 			call: &Self::Call
/// 		) -> TransactionValidity {
/// 			Err(TransactionValidityError::Invalid(InvalidTransaction::Call))
/// 		}
/// 	}
///
/// 	// Declare inherent provider for pallet (this is optional).
/// 	#[pallet::inherent]
/// 	impl<T: Config> ProvideInherent for Pallet<T> {
/// 		type Call = Call<T>;
/// 		type Error = InherentError;
///
/// 		const INHERENT_IDENTIFIER: InherentIdentifier = INHERENT_IDENTIFIER;
///
/// 		fn create_inherent(_data: &InherentData) -> Option<Self::Call> {
/// 			unimplemented!();
/// 		}
///
/// 		fn is_inherent(_call: &Self::Call) -> bool {
/// 			unimplemented!();
/// 		}
/// 	}
///
/// 	// Regular rust code needed for implementing ProvideInherent trait
///
/// 	#[derive(codec::Encode, sp_runtime::RuntimeDebug)]
/// 	#[cfg_attr(feature = "std", derive(codec::Decode))]
/// 	pub enum InherentError {
/// 	}
///
/// 	impl sp_inherents::IsFatalError for InherentError {
/// 		fn is_fatal_error(&self) -> bool {
/// 			unimplemented!();
/// 		}
/// 	}
///
/// 	pub const INHERENT_IDENTIFIER: sp_inherents::InherentIdentifier = *b"testpall";
/// }
/// ```
///
/// # Example of an instantiable pallet
///
/// ```
/// pub use pallet::*;
///
/// #[frame_support::pallet]
/// pub mod pallet {
/// 	use frame_support::pallet_prelude::*;
/// 	use frame_system::pallet_prelude::*;
///
/// 	type BalanceOf<T, I = ()> = <T as Config<I>>::Balance;
///
/// 	#[pallet::config]
/// 	pub trait Config<I: 'static = ()>: frame_system::Config {
/// 		#[pallet::constant]
/// 		type MyGetParam: Get<u32>;
/// 		type Balance: Parameter + MaxEncodedLen + From<u8>;
/// 		type RuntimeEvent: From<Event<Self, I>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;
/// 	}
///
/// 	#[pallet::extra_constants]
/// 	impl<T: Config<I>, I: 'static> Pallet<T, I> {
/// 		/// Some description
/// 		fn extra_constant_name() -> u128 { 4u128 }
/// 	}
///
/// 	#[pallet::pallet]
/// 	#[pallet::generate_store(pub(super) trait Store)]
/// 	pub struct Pallet<T, I = ()>(PhantomData<(T, I)>);
///
/// 	#[pallet::hooks]
/// 	impl<T: Config<I>, I: 'static> Hooks<BlockNumberFor<T>> for Pallet<T, I> {
/// 	}
///
/// 	#[pallet::call]
/// 	impl<T: Config<I>, I: 'static> Pallet<T, I> {
/// 		/// Doc comment put in metadata
/// 		#[pallet::weight(0)]
/// 		pub fn toto(origin: OriginFor<T>, #[pallet::compact] _foo: u32) -> DispatchResultWithPostInfo {
/// 			let _ = origin;
/// 			unimplemented!();
/// 		}
/// 	}
///
/// 	#[pallet::error]
/// 	pub enum Error<T, I = ()> {
/// 		/// doc comment put into metadata
/// 		InsufficientProposersBalance,
/// 	}
///
/// 	#[pallet::event]
/// 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
/// 	pub enum Event<T: Config<I>, I: 'static = ()> {
/// 		/// doc comment put in metadata
/// 		Proposed(<T as frame_system::Config>::AccountId),
/// 		/// doc
/// 		Spending(BalanceOf<T, I>),
/// 		Something(u32),
/// 	}
///
/// 	#[pallet::type_value]
/// 	pub(super) fn MyDefault<T: Config<I>, I: 'static>() -> T::Balance { 3.into() }
///
/// 	#[pallet::storage]
/// 	pub(super) type MyStorageValue<T: Config<I>, I: 'static = ()> =
/// 		StorageValue<Value = T::Balance, QueryKind = ValueQuery, OnEmpty = MyDefault<T, I>>;
///
/// 	#[pallet::storage]
/// 	#[pallet::getter(fn my_storage)]
/// 	#[pallet::storage_prefix = "SomeOtherName"]
/// 	pub(super) type MyStorage<T, I = ()> =
/// 		StorageMap<Hasher = Blake2_128Concat, Key = u32, Value = u32>;
///
/// 	#[pallet::genesis_config]
/// 	#[derive(Default)]
/// 	pub struct GenesisConfig {
/// 		_myfield: u32,
/// 	}
///
/// 	#[pallet::genesis_build]
/// 	impl<T: Config<I>, I: 'static> GenesisBuild<T, I> for GenesisConfig {
/// 		fn build(&self) {}
/// 	}
///
/// 	#[pallet::origin]
/// 	pub struct Origin<T, I = ()>(PhantomData<(T, I)>);
///
/// 	#[pallet::validate_unsigned]
/// 	impl<T: Config<I>, I: 'static> ValidateUnsigned for Pallet<T, I> {
/// 		type Call = Call<T, I>;
/// 		fn validate_unsigned(
/// 			source: TransactionSource,
/// 			call: &Self::Call
/// 		) -> TransactionValidity {
/// 			Err(TransactionValidityError::Invalid(InvalidTransaction::Call))
/// 		}
/// 	}
///
/// 	#[pallet::inherent]
/// 	impl<T: Config<I>, I: 'static> ProvideInherent for Pallet<T, I> {
/// 		type Call = Call<T, I>;
/// 		type Error = InherentError;
///
/// 		const INHERENT_IDENTIFIER: InherentIdentifier = INHERENT_IDENTIFIER;
///
/// 		fn create_inherent(_data: &InherentData) -> Option<Self::Call> {
/// 			unimplemented!();
/// 		}
///
/// 		fn is_inherent(_call: &Self::Call) -> bool {
/// 			unimplemented!();
/// 		}
/// 	}
///
/// 	// Regular rust code needed for implementing ProvideInherent trait
///
/// 	#[derive(codec::Encode, sp_runtime::RuntimeDebug)]
/// 	#[cfg_attr(feature = "std", derive(codec::Decode))]
/// 	pub enum InherentError {
/// 	}
///
/// 	impl sp_inherents::IsFatalError for InherentError {
/// 		fn is_fatal_error(&self) -> bool {
/// 			unimplemented!();
/// 		}
/// 	}
///
/// 	pub const INHERENT_IDENTIFIER: sp_inherents::InherentIdentifier = *b"testpall";
/// }
/// ```
///
/// # Upgrade guidelines
///
/// 1. Export the metadata of the pallet for later checks
///     - run your node with the pallet active
///     - query the metadata using the `state_getMetadata` RPC and curl, or use `subsee -p
///       <PALLET_NAME> > meta.json`
/// 2. Generate the template upgrade for the pallet provided by `decl_storage` with the
///     environment variable `PRINT_PALLET_UPGRADE`: `PRINT_PALLET_UPGRADE=1 cargo check -p
///     my_pallet`. This template can be used as it contains all information for storages,
///     genesis config and genesis build.
/// 3. Reorganize the pallet to have the trait `Config`, `decl_*` macros,
///     [`ValidateUnsigned`](`pallet_prelude::ValidateUnsigned`),
///     [`ProvideInherent`](`pallet_prelude::ProvideInherent`), and Origin` all together in one
///     file. Suggested order:
///     * `Config`,
///     * `decl_module`,
///     * `decl_event`,
///     * `decl_error`,
///     * `decl_storage`,
///     * `origin`,
///     * `validate_unsigned`,
///     * `provide_inherent`, so far it should compile and all be correct.
/// 4. start writing the new pallet module
/// 	```ignore
/// 	pub use pallet::*;
///
/// 	#[frame_support::pallet]
/// 	pub mod pallet {
/// 		use frame_support::pallet_prelude::*;
/// 		use frame_system::pallet_prelude::*;
/// 		use super::*;
///
/// 		#[pallet::pallet]
/// 		#[pallet::generate_store($visibility_of_trait_store trait Store)]
/// 		// NOTE: if the visibility of trait store is private but you want to make it available
/// 		// in super, then use `pub(super)` or `pub(crate)` to make it available in crate.
/// 		pub struct Pallet<T>(_);
/// 		// pub struct Pallet<T, I = ()>(PhantomData<T>); // for instantiable pallet
/// 	}
/// 	```
/// 5. **migrate Config**: move trait into the module with
///     * all const in `decl_module` to [`#[pallet::constant]`](#palletconstant)
///     * add the bound `IsType<<Self as frame_system::Config>::RuntimeEvent>` to `type
///       RuntimeEvent`
/// 7. **migrate decl_module**: write:
/// 	```ignore
/// 	#[pallet::hooks]
/// 	impl<T: Config> Hooks for Pallet<T> {
/// 	}
/// 	```
///     and write inside `on_initialize`, `on_finalize`, `on_runtime_upgrade`,
///     `offchain_worker`, and `integrity_test`.
///
/// 	then write:
/// 	```ignore
/// 	#[pallet::call]
/// 	impl<T: Config> Pallet<T> {
/// 	}
/// 	```
///     and write inside all the calls in `decl_module` with a few changes in the signature:
///     - origin must now be written completely, e.g. `origin: OriginFor<T>`
///     - result type must be `DispatchResultWithPostInfo`, you need to write it and also you
///    might need to put `Ok(().into())` at the end or the function.
///     - `#[compact]` must now be written
///       [`#[pallet::compact]`](#palletcompact-some_arg-some_type)
///     - `#[weight = ..]` must now be written [`#[pallet::weight(..)]`](#palletweightexpr)
///
/// 7. **migrate event**: rewrite as a simple enum with the attribute
///    [`#[pallet::event]`](#event-palletevent-optional), use [`#[pallet::generate_deposit($vis
///    fn deposit_event)]`](#event-palletevent-optional) to generate `deposit_event`,
/// 8. **migrate error**: rewrite it with attribute
///    [`#[pallet::error]`](#error-palleterror-optional).
/// 9. **migrate storage**: `decl_storage` provide an upgrade template (see 3.). All storages,
///     genesis config, genesis build and default implementation of genesis config can be
///     taken from it directly.
///
///     Otherwise here is the manual process:
///
///     first migrate the genesis logic. write:
/// 	```ignore
/// 	#[pallet::genesis_config]
/// 	struct GenesisConfig {
/// 		// fields of add_extra_genesis
/// 	}
/// 	impl Default for GenesisConfig {
/// 		// type default or default provided for fields
/// 	}
/// 	#[pallet::genesis_build]
/// 	impl<T: Config> GenesisBuild<T> for GenesisConfig {
/// 	// for instantiable pallet:
/// 	// `impl<T: Config, I: 'static> GenesisBuild<T, I> for GenesisConfig {
/// 		fn build() {
/// 			// The add_extra_genesis build logic
/// 		}
/// 	}
/// 	```
///     for each storage, if it contains `config(..)` then add fields, and make it default to
///     the value in `= ..;` or the type default if none, if it contains no build then also add
///     the logic to build the value. for each storage if it contains `build(..)` then add the
///     logic to `genesis_build`.
///
///     NOTE: within `decl_storage`: the individual config is executed first, followed by the
///     build and finally the `add_extra_genesis` build.
///
///     Once this is done you can migrate storages individually, a few notes:
///     - for private storage use `pub(crate) type ` or `pub(super) type` or nothing,
///     - for storages with `get(fn ..)` use [`#[pallet::getter(fn
///       ...)]`](#palletgetterfn-my_getter_fn_name-optional)
///     - for storages with value being `Option<$something>` make generic `Value` being
///       `$something` and generic `QueryKind` being `OptionQuery` (note: this is default).
///       Otherwise make `Value` the complete value type and `QueryKind` being `ValueQuery`.
///     - for storages with default value: `= $expr;` provide some specific `OnEmpty` generic.
///       To do so use of `#[pallet::type_value]` to generate the wanted struct to put.
///       example: `MyStorage: u32 = 3u32` would be written:
///
/// 	  	```ignore
/// 		#[pallet::type_value] fn MyStorageOnEmpty() -> u32 { 3u32 }
/// 		#[pallet::storage]
/// 		pub(super) type MyStorage<T> = StorageValue<_, u32, ValueQuery, MyStorageOnEmpty>;
/// 		```
///
///       NOTE: `decl_storage` also generates the functions `assimilate_storage` and
///       `build_storage` directly on `GenesisConfig`, and these are sometimes used in tests.
///       In order not to break they can be implemented manually, one can implement those
///       functions by calling the `GenesisBuild` implementation.
/// 10. **migrate origin**: move the origin to the pallet module to be under a
///     [`#[pallet::origin]`](#origin-palletorigin-optional) attribute
/// 11. **migrate validate_unsigned**: move the
///     [`ValidateUnsigned`](`pallet_prelude::ValidateUnsigned`) implementation to the pallet
///     module under a
///     [`#[pallet::validate_unsigned]`](#validate-unsigned-palletvalidate_unsigned-optional)
///     attribute
/// 12. **migrate provide_inherent**: move the
///     [`ProvideInherent`](`pallet_prelude::ProvideInherent`) implementation to the pallet
///     module under a [`#[pallet::inherent]`](#inherent-palletinherent-optional) attribute
/// 13. rename the usage of `Module` to `Pallet` inside the crate.
/// 14. migration is done, now double check the migration with the checking migration
///     guidelines shown below.
///
/// # Checking upgrade guidelines:
///
/// * compare metadata. Use [subsee](https://github.com/ascjones/subsee) to fetch the metadata
///   and do a diff of the resulting json before and after migration. This checks for:
/// 		* call, names, signature, docs
///     * event names, docs
///     * error names, docs
///     * storage names, hasher, prefixes, default value
///     * error, error, constant
/// * manually check that:
///     * `Origin` was moved inside the macro under
///       [`#[pallet::origin]`](#origin-palletorigin-optional) if it exists
///     * [`ValidateUnsigned`](`pallet_prelude::ValidateUnsigned`) was moved inside the macro
///       under
/// 	  [`#[pallet::validate_unsigned)]`](#validate-unsigned-palletvalidate_unsigned-optional)
/// 	  if it exists
///     * [`ProvideInherent`](`pallet_prelude::ProvideInherent`) was moved inside the macro
///       under [`#[pallet::inherent)]`](#inherent-palletinherent-optional) if it exists
///     * `on_initialize` / `on_finalize` / `on_runtime_upgrade` / `offchain_worker` were moved
///       to the `Hooks` implementation
///     * storages with `config(..)` were converted to `GenesisConfig` field, and their default
///       is `= $expr;` if the storage has a default value
///     * storages with `build($expr)` or `config(..)` were built in `GenesisBuild::build`
///     * `add_extra_genesis` fields were converted to `GenesisConfig` field with their correct
///       default if specified
///     * `add_extra_genesis` build was written into `GenesisBuild::build`
/// * storage items defined with [`pallet`] use the name of the pallet provided by
///   [`traits::PalletInfo::name`] as `pallet_prefix` (in `decl_storage`, storage items used
///   the `pallet_prefix` given as input of `decl_storage` with the syntax `as Example`). Thus
///   a runtime using the pallet must be careful with this change. To handle this change:
///     * either ensure that the name of the pallet given to `construct_runtime!` is the same
///       as the name the pallet was giving to `decl_storage`,
///     * or do a storage migration from the old prefix used to the new prefix used.
///
/// NOTE: The prefixes used by storage items are in metadata. Thus, ensuring the metadata
/// hasn't changed ensures that the `pallet_prefix`s used by the storage items haven't changed.
///
/// # Notes when macro fails to show proper error message spans:
///
/// Rustc loses span for some macro input. Some tips to fix it:
/// * do not use inner attribute:
/// 	```ignore
/// 	#[pallet]
/// 	pub mod pallet {
/// 		//! This inner attribute will make span fail
/// 		..
/// 	}
/// 	```
/// * use the newest nightly possible.
pub use frame_support_procedural::pallet;

/// Contains macro stubs for all of the pallet:: macros
pub mod pallet_macros {
	pub use frame_support_procedural::{
		call_index, compact, composite_enum, config, constant,
		disable_frame_system_supertrait_check, error, event, extra_constants, generate_deposit,
		generate_store, genesis_build, genesis_config, getter, hooks, inherent, no_default, origin,
		storage, storage_prefix, storage_version, type_value, unbounded, validate_unsigned, weight,
		whitelist_storage,
	};
}

#[doc(inline)]
pub use frame_support_procedural::register_default_impl;

// Generate a macro that will enable/disable code based on `std` feature being active.
sp_core::generate_feature_enabled_macro!(std_enabled, feature = "std", $);