use <UncheckedExtrinsic as Checkable>::Checked

addresses paritytech/polkadot#287 (comment)

polkadot/runtime/src/lib.rs

@@ -92,8 +92,6 @@ pub type Address = staking::Address<Concrete>;
 pub type BlockId = generic::BlockId<Block>;
 /// Unchecked extrinsic type as expected by this runtime.
 pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<Address, Index, Call, Signature>;
-/// Checked extrinsic type as expected by this runtime.
-pub type CheckedExtrinsic = generic::CheckedExtrinsic<AccountId, Index, Call>;
 /// Extrinsic type as expected by this runtime. This is not the type that is signed.
 pub type Extrinsic = generic::Extrinsic<Address, Index, Call>;
 /// Extrinsic type that is signed.

polkadot/transaction-pool/src/lib.rs

@@ -48,12 +48,15 @@ use extrinsic_pool::{Pool, Listener, txpool::{self, Readiness, scoring::{Change,
 use extrinsic_pool::api::ExtrinsicPool;
 use polkadot_api::PolkadotApi;
 use primitives::{AccountId, BlockId, Hash, Index, UncheckedExtrinsic as FutureProofUncheckedExtrinsic};
-use runtime::{Address, UncheckedExtrinsic, CheckedExtrinsic};
+use runtime::{Address, UncheckedExtrinsic};
 use substrate_runtime_primitives::traits::{Bounded, Checkable, Hashing, BlakeTwo256};
 
 pub use extrinsic_pool::txpool::{Options, Status, LightStatus, VerifiedTransaction as VerifiedTransactionOps};
 pub use error::{Error, ErrorKind, Result};
 
+/// Type alias for convenience.
+pub type CheckedExtrinsic = <UncheckedExtrinsic as Checkable<fn(Address) -> std::result::Result<AccountId, &'static str>>>::Checked;
+
 /// A verified transaction which should be includable and non-inherent.
 #[derive(Clone, Debug)]
 pub struct VerifiedTransaction {