clean up some unsafety in Slicable

substrate/wasm-runtime/polkadot/src/support/primitives.rs

@@ -76,7 +76,7 @@ impl Slicable for Header {
 		})
 	}
 
-	fn set_as_slice<F: FnOnce(&mut[u8]) -> bool>(_fill_slice: F) -> Option<Self> {
+	fn set_as_slice<F: FnOnce(&mut [u8]) -> bool>(_fill_slice: F) -> Option<Self> {
 		unimplemented!();
 	}
 
@@ -122,7 +122,7 @@ impl Slicable for Transaction {
 		})
 	}
 
-	fn set_as_slice<F: FnOnce(&mut[u8]) -> bool>(_fill_slice: F) -> Option<Self> {
+	fn set_as_slice<F: FnOnce(&mut [u8]) -> bool>(_fill_slice: F) -> Option<Self> {
 		unimplemented!();
 	}
 
@@ -200,7 +200,7 @@ impl Slicable for UncheckedTransaction {
 		})
 	}
 
-	fn set_as_slice<F: FnOnce(&mut[u8]) -> bool>(_fill_slice: F) -> Option<Self> {
+	fn set_as_slice<F: FnOnce(&mut [u8]) -> bool>(_fill_slice: F) -> Option<Self> {
 		unimplemented!();
 	}
 
@@ -237,7 +237,7 @@ impl Slicable for Block {
 		})
 	}
 
-	fn set_as_slice<F: FnOnce(&mut[u8]) -> bool>(_fill_slice: F) -> Option<Self> {
+	fn set_as_slice<F: FnOnce(&mut [u8]) -> bool>(_fill_slice: F) -> Option<Self> {
 		unimplemented!();
 	}
 
@@ -271,7 +271,7 @@ impl<T: NonTrivialSlicable> Slicable for Vec<T> {
 		Some(r)
 	}
 
-	fn set_as_slice<F: FnOnce(&mut[u8]) -> bool>(_fill_slice: F) -> Option<Self> {
+	fn set_as_slice<F: FnOnce(&mut [u8]) -> bool>(_fill_slice: F) -> Option<Self> {
 		unimplemented!();
 	}
 

substrate/wasm-runtime/polkadot/src/support/storable.rs

@@ -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 + Sized + EndianSensitive> Storable for T {
+impl<T: Default + Copy + EndianSensitive + 'static> Storable for T {
 	fn lookup(key: &[u8]) -> Option<Self> {
 		Slicable::set_as_slice(|out| runtime_support::read_storage(&twox_128(key)[..], out) == out.len())
 	}