Rename syntax to rustc_ast in source code

Author: petrochenkov

src/doc/unstable-book/src/language-features/plugin.md

@@ -42,7 +42,7 @@ that warns about any item named `lintme`.
 #![feature(plugin_registrar)]
 #![feature(box_syntax, rustc_private)]
 
-extern crate syntax;
+extern crate rustc_ast;
 
 // Load rustc as a plugin to get macros
 #[macro_use]
@@ -52,7 +52,7 @@ extern crate rustc_driver;
 use rustc::lint::{EarlyContext, LintContext, LintPass, EarlyLintPass,
                   EarlyLintPassObject, LintArray};
 use rustc_driver::plugin::Registry;
-use syntax::ast;
+use rustc_ast::ast;
 
 declare_lint!(TEST_LINT, Warn, "Warn about items named 'lintme'");
 

src/librustc/Cargo.toml

@@ -28,7 +28,7 @@ rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_errors = { path = "../librustc_errors" }
 rustc_index = { path = "../librustc_index" }
 rustc_serialize = { path = "../libserialize", package = "serialize" }
-syntax = { path = "../librustc_ast", package = "rustc_ast" }
+rustc_ast = { path = "../librustc_ast" }
 rustc_span = { path = "../librustc_span" }
 backtrace = "0.3.40"
 parking_lot = "0.9"