Have "aborting due to previous errors" message show an error count

Author: lkuper

src/compiletest/runtest.rs

@@ -266,7 +266,7 @@ fn check_expected_errors(expected_errors: [errors::expected_error],
         }
 
         // ignore this msg which gets printed at the end
-        if str::contains(line, "aborting due to previous errors") {
+        if str::contains(line, "aborting due to") {
             was_expected = true;
         }
 

src/libsyntax/diagnostic.rs

@@ -87,7 +87,9 @@ impl codemap_handler of handler for handler_t {
     fn has_errors() -> bool { self.err_count > 0u }
     fn abort_if_errors() {
         if self.err_count > 0u {
-            self.fatal("aborting due to previous errors");
+            let s = #fmt["aborting due to %u previous errors",
+                         self.err_count];
+            self.fatal(s);
         }
     }
     fn warn(msg: str) {