Cleaned up a few panic!()s

src/parser/stage/tokenize.rs

@@ -28,7 +28,7 @@ fn push_token(g: &mut VecDeque<Token>, t: Option<Token>, stop_i: usize) {
 
 		Token::Group(_,_)
 		| Token::Container(_)
-		=> panic!()
+		=> unreachable!()
 	};
 
 

src/parser/token.rs

@@ -96,7 +96,7 @@ impl Token {
 			| Token::GroupStart(_)
 			| Token::GroupEnd(_)
 			| Token::Group(_, _)
-			=> panic!()
+			=> panic!("This token cannot be converted to an expression")
 		};
 	}