Future compatiblity warning: `{:.*}` precision will be limited to `u16::MAX` in future Rust version

[m-ou-se]

Hi there!

In the Rust compiler and standard library we're planning to limit the width and precision formatting options to a u16. This means that, in a future version of Rust, this line will panic when max_len is larger than u16::MAX:

stream-rust/src/base.rs

Line 638 in 420283f

let result = format!("{:.*}", max_len, s);

This is the only code we found on all of Crates.io and GitHub that triggers the new runtime panic. This is a heads-up to give you the time to adjust your code. Apologies for breaking your code.

See rust-lang/rust#136932 for more information.

If you have any thoughts or concerns about the planned change, feel free to leave a comment on that pull request.

Thanks!

[vasekp]

Wow, the only code on all of Crates.io and GitHub? 😀 Thank you so much for your hard work identifying not only what breaks but actually tracking the parts of code leading to the values "close to" usize::MAX! Glad to hear from you about this.

This was nothing but a laziness on my part, equivalent to no limit on precision in all intended cases. I'll fix this promptly.