modernize some files

crates/ra_syntax/src/lib.rs

@@ -20,13 +20,6 @@
 #![allow(missing_docs)]
 //#![warn(unreachable_pub)] // rust-lang/rust#47816
 
-extern crate arrayvec;
-extern crate drop_bomb;
-extern crate itertools;
-extern crate parking_lot;
-extern crate rowan;
-extern crate unicode_xid;
-
 #[cfg(test)]
 #[macro_use]
 extern crate test_utils;
@@ -48,11 +41,11 @@ pub mod utils;
 mod validation;
 mod yellow;
 
+pub use rowan::{SmolStr, TextRange, TextUnit};
 pub use crate::{
     ast::AstNode,
     lexer::{tokenize, Token},
     reparsing::AtomEdit,
-    rowan::{SmolStr, TextRange, TextUnit},
     syntax_kinds::SyntaxKind,
     yellow::{
         Direction, OwnedRoot, RefRoot, SyntaxError, SyntaxNode, SyntaxNodeRef, TreeRoot, WalkEvent, Location,