Only error on unfixed diagnostics

src/tools/compiletest/src/runtest.rs

@@ -3122,10 +3122,12 @@ impl<'test> TestCx<'test> {
                 self.fatal_proc_rec("failed to compile fixed code", &res);
             }
             if !res.stderr.is_empty() && !self.props.rustfix_only_machine_applicable {
+                if !json::rustfix_diagnostics_only(&res.stderr).is_empty() {
                     self.fatal_proc_rec("fixed code is still producing diagnostics", &res);
                 }
             }
         }
+    }
 
     fn run_mir_opt_test(&self) {
         let pm = self.pass_mode();