Fix order of diff when rustdoc tests fail

diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 4ca0b2aba0ad1c64edaab74c90afedd61fcbfa9c..57926fedfd47118d8d2d8639d2bba3b7f99aa163 100644 (file)
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -2436,7 +2436,7 @@ fn compare_to_default_rustdoc(&mut self, out_dir: &Path) {
             })
         };
         let mut diff = Command::new("diff");
-        diff.args(&["-u", "-r"]).args(&[out_dir, &compare_dir]);
+        diff.args(&["-u", "-r"]).args(&[&compare_dir, out_dir]);
 
         let output = if let Some(pager) = pager {
             let diff_pid = diff.stdout(Stdio::piped()).spawn().expect("failed to run `diff`");