---

yaml
---
r: 277954
b: refs/heads/auto
c: db8a9a9
h: refs/heads/master

Author: nikomatsakis

[refs]

@@ -8,7 +8,7 @@ refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503
 refs/tags/release-0.3.1: 495bae036dfe5ec6ceafd3312b4dca48741e845b
 refs/tags/release-0.4: e828ea2080499553b97dfe33b3f4d472b4562ad7
 refs/tags/release-0.5: 7e3bcfbf21278251ee936ad53e92e9b719702d73
-refs/heads/auto: 9d151a71c032b655ca457521730044237c9e130e
+refs/heads/auto: db8a9a92b3dafcd5a8d7207096c8cbb90db0b013
 refs/tags/release-0.6: b4ebcfa1812664df5e142f0134a5faea3918544c
 refs/tags/0.1: b19db808c2793fe2976759b85a355c3ad8c8b336
 refs/tags/0.2: 1754d02027f2924bed83b0160ee340c7f41d5ea1

branches/auto/src/libsyntax/errors/mod.rs

@@ -20,6 +20,7 @@ use errors::emitter::{Emitter, EmitterWriter};
 use std::cell::{RefCell, Cell};
 use std::{error, fmt};
 use std::rc::Rc;
+use std::thread::panicking;
 use term;
 
 pub mod emitter;
@@ -352,7 +353,7 @@ impl<'a> fmt::Debug for DiagnosticBuilder<'a> {
 /// we emit a bug.
 impl<'a> Drop for DiagnosticBuilder<'a> {
     fn drop(&mut self) {
-        if !self.cancelled() {
+        if !panicking() && !self.cancelled() {
             self.emitter.borrow_mut().emit(&MultiSpan::new(),
                                            "Error constructed but not emitted",
                                            None,