Hack up the test harness to actually print the output we care about.

Author: khuey

src/tools/compiletest/src/runtest/ui.rs

@@ -24,7 +24,7 @@ impl TestCx<'_> {
         let pm = self.pass_mode();
         let should_run = self.should_run(pm);
         let emit_metadata = self.should_emit_metadata(pm);
-        let proc_res = self.compile_test(should_run, emit_metadata);
+        let mut proc_res = self.compile_test(should_run, emit_metadata);
         self.check_if_test_should_compile(self.props.fail_mode, pm, &proc_res);
         if matches!(proc_res.truncated, Truncated::Yes)
             && !self.props.dont_check_compiler_stdout
@@ -128,7 +128,7 @@ impl TestCx<'_> {
         }
 
         let output_to_check = if let WillExecute::Yes = should_run {
-            let proc_res = self.exec_compiled_test();
+            proc_res = self.exec_compiled_test();
             let run_output_errors = if self.props.check_run_results {
                 self.load_compare_outputs(&proc_res, TestOutput::Run, explicit)
             } else {