Replace Rc with Lrc for shared data

3 files changed, 6 insertions, 4 deletions

diff --git a/src/libsyntax_ext/Cargo.toml b/src/libsyntax_ext/Cargo.toml
index 1c470240288..d8eeb5ed255 100644
--- a/src/libsyntax_ext/Cargo.toml
+++ b/src/libsyntax_ext/Cargo.toml
@@ -14,3 +14,4 @@ proc_macro = { path = "../libproc_macro" }
 rustc_errors = { path = "../librustc_errors" }
 syntax = { path = "../libsyntax" }
 syntax_pos = { path = "../libsyntax_pos" }
+rustc_data_structures = { path = "../librustc_data_structures" }
\ No newline at end of file
diff --git a/src/libsyntax_ext/deriving/mod.rs b/src/libsyntax_ext/deriving/mod.rs
index 8159893e784..6bc4ee0b399 100644
--- a/src/libsyntax_ext/deriving/mod.rs
+++ b/src/libsyntax_ext/deriving/mod.rs
@@ -10,7 +10,7 @@
 
 //! The compiler code necessary to implement the `#[derive]` extensions.
 
-use std::rc::Rc;
+use rustc_data_structures::sync::Lrc;
 use syntax::ast;
 use syntax::ext::base::{Annotatable, ExtCtxt, SyntaxExtension, Resolver};
 use syntax::ext::build::AstBuilder;
@@ -65,7 +65,7 @@ macro_rules! derive_traits {
             $(
                 resolver.add_builtin(
                     ast::Ident::with_empty_ctxt(Symbol::intern($name)),
-                    Rc::new(SyntaxExtension::BuiltinDerive($func))
+                    Lrc::new(SyntaxExtension::BuiltinDerive($func))
                 );
             )*
         }
diff --git a/src/libsyntax_ext/lib.rs b/src/libsyntax_ext/lib.rs
index 82d6ee5afa0..772dec72ab9 100644
--- a/src/libsyntax_ext/lib.rs
+++ b/src/libsyntax_ext/lib.rs
@@ -23,6 +23,7 @@ extern crate fmt_macros;
 extern crate syntax;
 extern crate syntax_pos;
 extern crate proc_macro;
+extern crate rustc_data_structures;
 extern crate rustc_errors as errors;
 
 mod asm;
@@ -44,7 +45,7 @@ pub mod deriving;
 
 pub mod proc_macro_impl;
 
-use std::rc::Rc;
+use rustc_data_structures::sync::Lrc;
 use syntax::ast;
 use syntax::ext::base::{MacroExpanderFn, NormalTT, NamedSyntaxExtension};
 use syntax::symbol::Symbol;
@@ -55,7 +56,7 @@ pub fn register_builtins(resolver: &mut syntax::ext::base::Resolver,
     deriving::register_builtin_derives(resolver);
 
     let mut register = |name, ext| {
-        resolver.add_builtin(ast::Ident::with_empty_ctxt(name), Rc::new(ext));
+        resolver.add_builtin(ast::Ident::with_empty_ctxt(name), Lrc::new(ext));
     };
 
     macro_rules! register {