I’m traversing and parsing slice in Rust, and would like to build dynamic error message which indicates the slice data length when exception is thrown. Code is as below:

fn1(
        records: &[u8],
    ) -> Result<Vec<DocRecord>, nom::Err<nom::error::Error<&[u8]>>> {
        let mut collection = Vec::new();
        let mut data = records;
        while !data.is_empty() {
            let doc_record;
            (data, doc_record) = Self::fn2()(input).map_err(|_| {
                let error_message = format!(
                    "Parsing Error. Current data length: {}",
                    data.len()
                );
                nom::Err::Error(nom::error::Error::new(error_message.as_bytes(), nom::error::ErrorKind::Fail))
            })?;
            collection.push(doc_record);
        }

        Ok(collection)
    }

However build shows error saying error_message.as_bytes() is borrowed and the line returns a value referencing data owned by the current function. I then modified to

fn1(
        records: &[u8],
    ) -> Result<Vec<DocRecord>, nom::Err<nom::error::Error<&[u8]>>> {
        let mut collection = Vec::new();
        let mut data = records;
        while !data.is_empty() {
            let doc_record;
            let error_message = format!(
                    "Parsing Error. Current data length: {}",
                    data.len()
                );
            (data, doc_record) = Self::fn2()(input).map_err(|_| {
                nom::Err::Error(nom::error::Error::new(error_message.as_bytes(), nom::error::ErrorKind::Fail))
            })?;
            collection.push(doc_record);
        }

        Ok(collection)
    }

but still got the same error.
So how to get over this returns a value referencing data owned by the current function issue? Thanks