Traceback (most recent call last):
  File "/usr/lib/pypy3.9/py_compile.py", line 144, in compile
    code = loader.source_to_code(source_bytes, dfile or file,
  File "<builtin>/frozen importlib._bootstrap_external", line 927, in source_to_code
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "foo.py", line 2
    using namespace std;
    ^
SyntaxError: invalid syntax. Perhaps you forgot a comma?

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/pypy3.9/py_compile.py", line 150, in compile
    raise py_exc
py_compile.PyCompileError:   File "foo.py", line 2
    using namespace std;
    ^
SyntaxError: invalid syntax. Perhaps you forgot a comma?