Only retain external static symbols across LTO

[rust.git] / src / libsyntax / lib.rs

diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index c09e35f1077a53fca990cf05ee447ac2ab1369d2..d7d3e576a613d5fe9de131cf36624cc4b597b8dd 100644 (file)
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -22,6 +22,7 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/",
        test(attr(deny(warnings))))]
+#![cfg_attr(not(stage0), deny(warnings))]
 
 #![feature(associated_consts)]
 #![feature(filling_drop)]
@@ -40,17 +41,22 @@
 
 extern crate serialize as rustc_serialize; // used by deriving
 
-// A variant of 'try!' that panics on Err(FatalError). This is used as a
-// crutch on the way towards a non-panic!-prone parser. It should be used
-// for fatal parsing errors; eventually we plan to convert all code using
-// panictry to just use normal try
+// A variant of 'try!' that panics on an Err. This is used as a crutch on the
+// way towards a non-panic!-prone parser. It should be used for fatal parsing
+// errors; eventually we plan to convert all code using panictry to just use
+// normal try.
+// Exported for syntax_ext, not meant for general use.
+#[macro_export]
 macro_rules! panictry {
     ($e:expr) => ({
         use std::result::Result::{Ok, Err};
-        use errors::FatalError;
+        use $crate::errors::FatalError;
         match $e {
             Ok(e) => e,
-            Err(FatalError) => panic!(FatalError)
+            Err(mut e) => {
+                e.emit();
+                panic!(FatalError);
+            }
         }
     })
 }