fixed some grumbles

core/executor/src/wasm_executor.rs

@@ -16,7 +16,7 @@
 
 //! Rust implementation of Substrate contracts.
 
-use std::{collections::HashMap, convert::TryFrom, str};
+use std::{collections::HashMap, convert::TryFrom, str, panic};
 use tiny_keccak;
 use secp256k1;
 
@@ -77,12 +77,12 @@ impl<'e, E: Externalities<Blake2Hasher> + 'e> ExtHideout<'e, E> {
 	/// leading to process abort.
 	pub fn with_storage_ext<T, F>(&mut self, f: F) -> Result<T>
 		where
-			F: ::std::panic::UnwindSafe + FnOnce(&mut dyn StorageExternalities<Blake2Hasher>) -> Result<T>
+			F: panic::UnwindSafe + FnOnce(&mut dyn StorageExternalities<Blake2Hasher>) -> Result<T>
 	{
 		// it is safe beause basic methods of StorageExternalities are guaranteed to touch only
 		// its internal state + we should discard it on error
-		let mut ext = std::panic::AssertUnwindSafe(&mut *self.0);
-		std::panic::catch_unwind(move || f(&mut **ext))
+		let mut ext = panic::AssertUnwindSafe(&mut *self.0);
+		panic::catch_unwind(move || f(&mut **ext))
 			.map_err(|_| Error::Runtime)
 			.and_then(|result| result)
 	}

core/state-machine/src/lib.rs

@@ -146,7 +146,7 @@ impl fmt::Display for ExecutionError {
 
 type CallResult<R, E> = Result<NativeOrEncoded<R>, E>;
 
-/// Storage externalities API: pinned to specific active address.
+/// Storage externalities API.
 ///
 /// Implementations of methods of this trait guarantee that there are no side effects,
 /// other than modifications to some **internal state** which could easily be
@@ -255,7 +255,7 @@ pub trait StorageExternalities<H: Hasher> {
 	fn storage_changes_root(&mut self, parent: H::Out) -> Result<Option<H::Out>, ()> where H::Out: Ord;
 }
 
-/// Extra externalities API: pinned to specific active address.
+/// Externalities API.
 ///
 /// Methods of this trait may have side-effects.  Therefore, it isn't safe
 /// to catch unwinding of any panics that occur during calls to them.