zed-industries/zed · error

output span must be bounded by two marker tags

Error message

output span must be bounded by two marker tags

What it means

Raised in extract_marker_span_allow_same(): the output text is not bounded by marker tags — either the first or last marker tag was malformed, so the text cannot be interpreted as a marker-bounded span.

Source

Thrown at crates/zeta_prompt/src/hashed_regions.rs:217

}

pub fn extract_marker_span_allow_same(text: &str) -> Result<(String, String, String)> {
    let first_tag_start = text
        .find(MARKER_TAG_PREFIX)
        .context("no start marker found in output")?;
    let first_id_start = first_tag_start + MARKER_TAG_PREFIX.len();
    let first_id_end = text[first_id_start..]
        .find(MARKER_TAG_SUFFIX)
        .map(|i| i + first_id_start)
        .context("malformed start marker tag")?;
    let start_id = &text[first_id_start..first_id_end];
    let first_tag_end = first_id_end + MARKER_TAG_SUFFIX.len();

    let last_tag_start = text
        .rfind(MARKER_TAG_PREFIX)
        .context("no end marker found in output")?;
    if last_tag_start == first_tag_start {
        return Err(anyhow!("output span must be bounded by two marker tags"));
    }
    let last_id_start = last_tag_start + MARKER_TAG_PREFIX.len();
    let last_id_end = text[last_id_start..]
        .find(MARKER_TAG_SUFFIX)
        .map(|i| i + last_id_start)
        .context("malformed end marker tag")?;
    let end_id = &text[last_id_start..last_id_end];

    let mut content_start = first_tag_end;
    if text.as_bytes().get(content_start) == Some(&b'\n') {
        content_start += 1;
    }
    let content_end = last_tag_start;
    let content = &text[content_start..content_end.max(content_start)];
    let content = multi_region::strip_marker_tags(content);
    Ok((start_id.to_string(), end_id.to_string(), content))
}

View on GitHub (pinned to f4178619ac)

Solutions

1. Regenerate the model output with proper start/end markers
2. Retry the edit request

When it happens

Trigger: Thrown at crates/zeta_prompt/src/hashed_regions.rs:217 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@f4178619ac (2026-08-20). Data as JSON: /api/errors/da9a26831dc8723e. Report an issue: GitHub.