無限ループ検出君

```Python
def trace_calls(frame, event, arg):
    if event != 'line':
        return trace_calls
    from functools import lru_cache
    from linecache import getline

    @lru_cache(maxsize=128)
    def line_cache(filename: str, line_no: int):
        return getline(filename, line_no).rstrip()

    co_filename: str = frame.f_code.co_filename
    if co_filename != __file__:
        return trace_calls

    lineno: int  = frame.f_lineno
    print(line_cache(co_filename, lineno))

    return trace_calls
    
sys.settrace(trace_calls)
# 無限ループになる処理

#
sys.settrace(None)
```