diff --git a/substrate/wasm-runtime/polkadot/src/codec/endiansensitive.rs b/substrate/wasm-runtime/polkadot/src/codec/endiansensitive.rs
index a1576284228e952e51be44b55af5f8b48dfbf845..c4978d5ce4721685bb81e932177825e6ca033b96 100644
--- a/substrate/wasm-runtime/polkadot/src/codec/endiansensitive.rs
+++ b/substrate/wasm-runtime/polkadot/src/codec/endiansensitive.rs
@@ -17,7 +17,8 @@
//! Endian manager.
/// Trait to allow conversion to a know endian representation when sensitive.
-pub trait EndianSensitive: Sized {
+// note: the copy bound and static lifetimes are necessary for safety of `Slicable` blanket implementation.
+pub trait EndianSensitive: Copy + 'static {
fn to_le(self) -> Self { self }
fn to_be(self) -> Self { self }
fn from_le(self) -> Self { self }
@@ -48,3 +49,20 @@ impl_endians!(u16, u32, u64, usize, i16, i32, i64, isize);
impl_non_endians!(u8, i8, [u8; 1], [u8; 2], [u8; 3], [u8; 4], [u8; 5], [u8; 6], [u8; 7], [u8; 8],
[u8; 10], [u8; 12], [u8; 14], [u8; 16], [u8; 20], [u8; 24], [u8; 28], [u8; 32], [u8; 40],
[u8; 48], [u8; 56], [u8; 64], [u8; 80], [u8; 96], [u8; 112], [u8; 128]);
+
+#[cfg(test)]
+mod tests {
+ use super::EndianSensitive;
+
+ #[test]
+ fn endian_sensitive_is_copy() {
+ fn _takes_copy<T: Copy>() { }
+ fn _takes_endian_sensitive<T: EndianSensitive>() { _takes_copy::<T>() }
+ }
+
+ #[test]
+ fn endian_sensitive_outlives_static() {
+ fn _takes_static<T: 'static>() { }
+ fn _takes_endian_sensitive<T: EndianSensitive>() { _takes_static::<T>() }
+ }
+}
diff --git a/substrate/wasm-runtime/polkadot/src/codec/joiner.rs b/substrate/wasm-runtime/polkadot/src/codec/joiner.rs
index db38cacbd95ccb6ef6e891c30db1333df3006101..7fdb1e16456c61d4865894ac391110186aba81ea 100644
--- a/substrate/wasm-runtime/polkadot/src/codec/joiner.rs
+++ b/substrate/wasm-runtime/polkadot/src/codec/joiner.rs
@@ -16,7 +16,7 @@
//! Vec<u8> serialiser.
-use runtime_support::vec::Vec;
+use runtime_support::prelude::*;
use slicable::Slicable;
/// Trait to allow itself to be serialised into a `Vec<u8>`
diff --git a/substrate/wasm-runtime/polkadot/src/codec/keyedvec.rs b/substrate/wasm-runtime/polkadot/src/codec/keyedvec.rs
index b1f903643c1d7543239271598ae9d54b190dfe56..210606ab7c92331de901497f524ef821891a8844 100644
--- a/substrate/wasm-runtime/polkadot/src/codec/keyedvec.rs
+++ b/substrate/wasm-runtime/polkadot/src/codec/keyedvec.rs
@@ -16,7 +16,7 @@
//! Serialiser and prepender.
-use runtime_support::vec::Vec;
+use runtime_support::prelude::*;
use slicable::Slicable;
/// Trait to allow itselg to be serialised and prepended by a given slice.
diff --git a/substrate/wasm-runtime/polkadot/src/codec/slicable.rs b/substrate/wasm-runtime/polkadot/src/codec/slicable.rs
index 2dfc2db49fd61207c70c9c459dca52f66920d66b..40f8a532b7131e0c001a4c5ad83dfbc40327d3c1 100644
--- a/substrate/wasm-runtime/polkadot/src/codec/slicable.rs
+++ b/substrate/wasm-runtime/polkadot/src/codec/slicable.rs
@@ -16,7 +16,7 @@
//! Serialisation.
-use runtime_support::vec::Vec;
+use runtime_support::prelude::*;
use runtime_support::{mem, slice};
use joiner::Joiner;
use endiansensitive::EndianSensitive;
@@ -44,8 +44,7 @@ pub trait Slicable: Sized {
/// Trait to mark that a type is not trivially (essentially "in place") serialisable.
pub trait NonTrivialSlicable: Slicable {}
-// note: the copy bound and static lifetimes are necessary for safety of `set_as_slice`.
-impl<T: Copy + EndianSensitive + 'static> Slicable for T {
+impl<T: EndianSensitive> Slicable for T {
fn set_as_slice<F: FnOnce(&mut [u8]) -> bool>(fill_slice: F) -> Option<Self> {
let size = mem::size_of::<T>();
let mut result: T = unsafe { mem::zeroed() };
diff --git a/substrate/wasm-runtime/polkadot/src/runtime/consensus.rs b/substrate/wasm-runtime/polkadot/src/runtime/consensus.rs
index 1b897a86cab083308b2c33c492ef361d215e3094..689fdca21e682a81c797ba43f2e966206ce47970 100644
--- a/substrate/wasm-runtime/polkadot/src/runtime/consensus.rs
+++ b/substrate/wasm-runtime/polkadot/src/runtime/consensus.rs
@@ -16,7 +16,7 @@
//! Conensus module for runtime; manages the authority set ready for the native code.
-use runtime_support::vec::Vec;
+use runtime_support::prelude::*;
use storable::StorageVec;
use primitives::SessionKey;
diff --git a/substrate/wasm-runtime/polkadot/src/runtime/session.rs b/substrate/wasm-runtime/polkadot/src/runtime/session.rs
index 34c67c9811c751347144538c115b7a4fb67f2113..6914bdc6558834d55682b3860f556c53102fcf42 100644
--- a/substrate/wasm-runtime/polkadot/src/runtime/session.rs
+++ b/substrate/wasm-runtime/polkadot/src/runtime/session.rs
@@ -17,7 +17,7 @@
//! Session manager: is told the validators and allows them to manage their session keys for the
//! consensus module.
-use runtime_support::vec::Vec;
+use runtime_support::prelude::*;
use keyedvec::KeyedVec;
use storable::{kill, Storable, StorageVec};
use primitives::{AccountID, SessionKey, BlockNumber};
diff --git a/substrate/wasm-runtime/polkadot/src/runtime/staking.rs b/substrate/wasm-runtime/polkadot/src/runtime/staking.rs
index 5f39ec14b26128757e4d10a9c03a877939c4e382..9b0c659f5c9abd9b6c17858d2981a6e554d09159 100644
--- a/substrate/wasm-runtime/polkadot/src/runtime/staking.rs
+++ b/substrate/wasm-runtime/polkadot/src/runtime/staking.rs
@@ -16,7 +16,7 @@
//! Staking manager: Handles balances and periodically determines the best set of validators.
-use runtime_support::vec::Vec;
+use runtime_support::prelude::*;
use keyedvec::KeyedVec;
use storable::{Storable, StorageVec};
use primitives::{BlockNumber, AccountID};
diff --git a/substrate/wasm-runtime/polkadot/src/runtime/system.rs b/substrate/wasm-runtime/polkadot/src/runtime/system.rs
index f6243ff4f7c15baa951399981d30540025258b6e..072e17df010c9061014039bbeb29232d5de748e7 100644
--- a/substrate/wasm-runtime/polkadot/src/runtime/system.rs
+++ b/substrate/wasm-runtime/polkadot/src/runtime/system.rs
@@ -19,7 +19,7 @@
use primitives::{Block, BlockNumber, Hash, UncheckedTransaction, TxOrder, Hashable};
use runtime_support::mem;
-use runtime_support::vec::Vec;
+use runtime_support::prelude::*;
use storable::Storable;
use keyedvec::KeyedVec;
use environment::with_env;
diff --git a/substrate/wasm-runtime/polkadot/src/support/primitives.rs b/substrate/wasm-runtime/polkadot/src/support/primitives.rs
index ea94c0319051931cbb3bf27798cb4bb91260aff3..338be8071050e7ef14eb64023811c2437bc3ca42 100644
--- a/substrate/wasm-runtime/polkadot/src/support/primitives.rs
+++ b/substrate/wasm-runtime/polkadot/src/support/primitives.rs
@@ -16,7 +16,7 @@
//! Primitive types.
-use runtime_support::vec::Vec;
+use runtime_support::prelude::*;
use streamreader::StreamReader;
use joiner::Joiner;
use slicable::{Slicable, NonTrivialSlicable};
diff --git a/substrate/wasm-runtime/polkadot/src/support/storable.rs b/substrate/wasm-runtime/polkadot/src/support/storable.rs
index 835e70ff3d51fbb7f9f8018a406850768f8b598a..9a871a638be5cc7c5596c9124175b9b1b7fcbf14 100644
--- a/substrate/wasm-runtime/polkadot/src/support/storable.rs
+++ b/substrate/wasm-runtime/polkadot/src/support/storable.rs
@@ -19,7 +19,7 @@
use slicable::Slicable;
use endiansensitive::EndianSensitive;
use keyedvec::KeyedVec;
-use runtime_support::vec::Vec;
+use runtime_support::prelude::*;
use runtime_support::{self, twox_128};
/// Trait for a value which may be stored in the storage DB.
@@ -37,7 +37,7 @@ pub trait Storable {
/// Remove `key` from storage.
pub fn kill(key: &[u8]) { runtime_support::set_storage(&twox_128(key)[..], b""); }
-impl<T: Default + Copy + EndianSensitive + 'static> Storable for T {
+impl<T: Default + EndianSensitive> Storable for T {
fn lookup(key: &[u8]) -> Option<Self> {
Slicable::set_as_slice(|out| runtime_support::read_storage(&twox_128(key)[..], out) == out.len())
}