Check expected file after successful translation

Author: lucic71

tests/lit/lit/formats/Cpp2RustTest.py

@@ -96,10 +96,6 @@ def fail(str, code = fail_code):
       shutil.rmtree(tmp_dir, True)
       return code, str
 
-    expected_file = self.getExpectedFile(filepath, model, fname)
-    if not os.path.exists(expected_file) and not replace_expected:
-      return fail('no expected file')
-
     cmd = ['./cpp2rust/cpp2rust', '-file', cc_input, '-model', model,
            '-o', rs_file]
 
@@ -119,6 +115,10 @@ def fail(str, code = fail_code):
         return lit.Test.PASS, ''
       return fail('cpp2rust failed\n' + err)
 
+    expected_file = self.getExpectedFile(filepath, model, fname)
+    if not os.path.exists(expected_file) and not replace_expected:
+      return fail('no expected file')
+
     if replace_expected:
       self.updateExpected(generated, expected_file)