Fix double curlies

Pointed out by Arthur in D57624.

llvm-svn: 353140

diff --git a/libcxx/utils/generate_feature_test_macro_components.py b/libcxx/utils/generate_feature_test_macro_components.py
index d923208..c11846e 100755 (executable)
--- a/libcxx/utils/generate_feature_test_macro_components.py
+++ b/libcxx/utils/generate_feature_test_macro_components.py
@@ -865,7 +865,7 @@ def produce_tests():
 
 #endif // TEST_STD_VER > 17
 
-int main(int, char**) { return 0; }
+int main(int, char**) {{ return 0; }}
 """.format(script_name=script_name,
            header=h,
            test_tags=test_tags,