The below code blocks Python eval loop and makes it unresponsive to signals (like ^C).

    import reprlib

    try:
        raise RuntimeError
    except RuntimeError as ex:
        ex.__context__ = ex
        reprlib.repr(ex)

This isn't a bug of reprlib -- it's something in the core. Will create a separate issue for this.

    try:
        raise Exception
    except Exception as ex:
        ex.__context__ = ex
        hasattr(1, 'aa')