Ignore non_fmt_panic warning

[taiki-e]

No description provided.

[taiki-e]

Hmm, std::panic::panic_any requires Rust 1.51+. I'll ignore this warning for now.

[m-ou-se]

Is there any reason for not just using a panic!("test") instead of panic!(())? Part of the reason for moving this functionality to a separate function is to discourage use of non-string panics.

(Then instead of payload.is::<()>(), payload.downcast_ref() == Some(&"test") should work.)

[taiki-e]

using a panic!("test") instead of panic!(())

Sorry. I missed that this works.