finish purging x! from parity, remove x! and xx! macros

util/src/common.rs

@@ -68,20 +68,6 @@ macro_rules! mapx {
 	}}
 }
 
-#[macro_export]
-macro_rules! x {
-	( $x:expr ) => {
-		From::from($x)
-	}
-}
-
-#[macro_export]
-macro_rules! xx {
-	( $x:expr ) => {
-		From::from(From::from($x))
-	}
-}
-
 #[macro_export]
 macro_rules! flush {
 	($($arg:tt)*) => ($crate::flush(format!("{}", format_args!($($arg)*))));

util/src/keys/store.rs

@@ -627,7 +627,7 @@ mod tests {
 			sstore.sign(&address, &H256::random()).unwrap()
 		};
 
-		assert!(signature != x!(0));
+		assert!(signature != 0.into());
 	}
 
 	#[test]