Feature gate: #![feature(bufreader_peek)]

This is a tracking issue for the BufReader::peek method.

Public API

// std::io

impl BufReader {
    fn peek(&mut self, n: usize) -> io::Result<&[u8]>
}

Steps / History

• ACP Accepted: ACP: BufReader::peek libs-team#417
• Implementation: implement BufReader::peek #128406
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• what should happen if n > capacity? options are: short slice, error, or panic.
• should the buffer be completely filled, or should it only read the number of bytes requested?