Fatal error generated when insufficient data reached while parsing escaped sequence

[nirosys]

When insufficient data is encountered while parsing an escaped string sequence (appears to be all types of sequences, but I have not verified), an error is returned that is not correctly identified as Insufficient data. This is causing the raw text reader to fail rather than requesting more data.

[nirosys]

After some digging, just re-read the error and realized this is not a UTF-8 boundary issue, but rather the parser not correctly identifying an incomplete error while parsing escaped sequences.

Trivial repro:

let source = "\"123456\\u269b\"";
//                       ^-- First read stops here.
let mut reader = RawTextReader::new(source.as_bytes()[..10].to_owned());
reader.next()?;

Running that returns an Err of:

unexpected error after partial escaped sequence: unrecognized input near line 0: could not parse an escaped character (Unicode, hex, or literal): Parsing requires more data: '"123456\u2''

[nirosys]

A fix for this was merged a while ago, closing.