Move CrateConfig from Crate to ParseSess.

src/libsyntax/ext/base.rs

@@ -574,7 +574,6 @@ pub struct ExpansionData {
 /// -> expn_info of their expansion context stored into their span.
 pub struct ExtCtxt<'a> {
     pub parse_sess: &'a parse::ParseSess,
-    pub cfg: ast::CrateConfig,
     pub ecfg: expand::ExpansionConfig<'a>,
     pub crate_root: Option<&'static str>,
     pub resolver: &'a mut Resolver,
@@ -583,13 +582,12 @@ pub struct ExtCtxt<'a> {
 }
 
 impl<'a> ExtCtxt<'a> {
-    pub fn new(parse_sess: &'a parse::ParseSess, cfg: ast::CrateConfig,
+    pub fn new(parse_sess: &'a parse::ParseSess,
                ecfg: expand::ExpansionConfig<'a>,
                resolver: &'a mut Resolver)
                -> ExtCtxt<'a> {
         ExtCtxt {
             parse_sess: parse_sess,
-            cfg: cfg,
             ecfg: ecfg,
             crate_root: None,
             resolver: resolver,
@@ -617,11 +615,11 @@ impl<'a> ExtCtxt<'a> {
 
     pub fn new_parser_from_tts(&self, tts: &[tokenstream::TokenTree])
         -> parser::Parser<'a> {
-        parse::tts_to_parser(self.parse_sess, tts.to_vec(), self.cfg().clone())
+        parse::tts_to_parser(self.parse_sess, tts.to_vec())
     }
     pub fn codemap(&self) -> &'a CodeMap { self.parse_sess.codemap() }
     pub fn parse_sess(&self) -> &'a parse::ParseSess { self.parse_sess }
-    pub fn cfg(&self) -> &ast::CrateConfig { &self.cfg }
+    pub fn cfg(&self) -> &ast::CrateConfig { &self.parse_sess.config }
     pub fn call_site(&self) -> Span {
         self.codemap().with_expn_info(self.backtrace(), |ei| match ei {
             Some(expn_info) => expn_info.call_site,