Enumeratable accounts (#195)

* Merge remote-tracking branch 'origin/master' into gav-xts-dont-panic

* Update wasm.

* consensus, session and staking all panic-safe.

* Democracy doesn't panic in apply.

* Fix tests.

* Extra helper macro, council depanicked.

* Fix one test.

* Fix up all council tests. No panics!

* Council voting depanicked.

* Dispatch returns result.

* session & staking tests updated

* Fix democracy tests.

* Fix council tests.

* Fix up polkadot parachains in runtime

* Fix borked merge

* More Slicable support

Support general `Option` and array types.

* Basic storage types.

* Existential deposit for contract creation

* Basic implemnetation along with removals

* Fix tests.

* externalities builder fix.

* Tests.

* Fix up the runtime.

* Fix tests.

* Add generic `Address` type.

* Initial function integration of Address into Extrinsic.

* Fix build

* All tests compile.

* Fix (some) tests.

* Fix signing.

* Push error.

* transfer can accept Address

* Make Address generic over AccountIndex

* Fix test

* Make Council use Address for dispatch.

* Fix build

* Bend over backwards to support braindead derive.

* Repot some files.

* Fix tests.

* Fix grumbles

* Remove Default bound

* Fix build for new nightly.

* Make `apply_extrinsic` never panic, return useful Result.

* More merge hell

* Doesn't build, but might do soon

* Serde woes

* get substrate-runtime-staking compiling

* Polkadot builds again!

* Fix all build.

* Fix tests & binaries.

* Reserve some extra initial byte values of address for future format changes

* Make semantic of `ReservedBalance` clear.

* Fix panic handler.

* Integrate other balance transformations into the new model

Fix up staking tests.

* Fix runtime tests.

* Fix panic build.

* Tests for demonstrating interaction between balance types.

* Repot some runtime code

* Fix checkedblock in non-std builds

* Get rid of `DoLookup` phantom.

* Attempt to make transaction_pool work with lookups.

* Remove vscode settings

* New attempt at making transaction pool work.

* It builds again!

* --all builds

* Fix tests.

* New build.

* Test account nonce reset.

* polkadot transaction pool tests/framework.

* Address grumbles.

* Revert bad `map_or`

* Rebuild binaries, workaround.

* Avoid casting to usize early.

* reenable sync tests

substrate/substrate/runtime/system/Cargo.toml

@@ -6,6 +6,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 [dependencies]
 hex-literal = "0.1.0"
 serde = { version = "1.0", default_features = false }
+serde_derive = { version = "1.0", optional = true }
 safe-mix = { path = "../../../safe-mix", default_features = false}
 substrate-codec = { path = "../../codec", default_features = false }
 substrate-primitives = { path = "../../primitives", default_features = false }
@@ -18,6 +19,7 @@ substrate-runtime-primitives = { path = "../primitives", default_features = fals
 default = ["std"]
 std = [
 	"serde/std",
+	"serde_derive",
 	"safe-mix/std",
 	"substrate-codec/std",
 	"substrate-primitives/std",

substrate/substrate/runtime/system/src/lib.rs

@@ -28,6 +28,10 @@ extern crate substrate_runtime_support as runtime_support;
 #[cfg(feature = "std")]
 extern crate serde;
 
+#[cfg(feature = "std")]
+#[macro_use]
+extern crate serde_derive;
+
 extern crate substrate_runtime_io as runtime_io;
 extern crate substrate_codec as codec;
 extern crate substrate_runtime_primitives as primitives;
@@ -58,7 +62,7 @@ pub fn extrinsics_data_root<H: Hashing>(xts: Vec<Vec<u8>>) -> H::Output {
 	H::enumerated_trie_root(&xts)
 }
 
-pub trait Trait {
+pub trait Trait: Eq + Clone {
 	type Index: Parameter + Member + Default + MaybeDisplay + SimpleArithmetic + Copy;
 	type BlockNumber: Parameter + Member + MaybeDisplay + SimpleArithmetic + Default + Bounded + Copy + rstd::hash::Hash;
 	type Hash: Parameter + Member + MaybeDisplay + SimpleBitOps + Default + Copy + CheckEqual + rstd::hash::Hash + AsRef<[u8]>;
@@ -80,7 +84,7 @@ decl_module! {
 decl_storage! {
 	trait Store for Module<T: Trait>;
 
-	pub AccountIndex get(account_index): b"sys:non" => default map [ T::AccountId => T::Index ];
+	pub AccountNonce get(account_nonce): b"sys:non" => default map [ T::AccountId => T::Index ];
 	pub BlockHash get(block_hash): b"sys:old" => required map [ T::BlockNumber => T::Hash ];
 
 	pub ExtrinsicIndex get(extrinsic_index): b"sys:xti" => required u32;
@@ -170,8 +174,8 @@ impl<T: Trait> Module<T> {
 	}
 
 	/// Increment a particular account's nonce by 1.
-	pub fn inc_account_index(who: &T::AccountId) {
-		<AccountIndex<T>>::insert(who, Self::account_index(who) + T::Index::one());
+	pub fn inc_account_nonce(who: &T::AccountId) {
+		<AccountNonce<T>>::insert(who, Self::account_nonce(who) + T::Index::one());
 	}
 
 	/// Note what the extrinsic data of the current extrinsic index is. If this is called, then