syntax_data: {"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":"file.read_to_end(&mut"}]}
source_snippet:         file.read_to_end(&mut bytes)?;
context_before:         let mut bytes: Vec<u8> = bytes.iter().copied().chain(probe[..n].iter().copied()).collect();
context_after:         Ok(bytes.into())