You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/tantivy/src/query/phrase_query
    
    the code of the file until where you have to start completion: mod phrase_query;
mod phrase_scorer;
mod phrase_weight;

pub use self::phrase_query::PhraseQuery;
pub(crate) use self::phrase_scorer::intersection_count;
pub use self::phrase_scorer::PhraseScorer;
pub use self::phrase_weight::PhraseWeight;

#[cfg(test)]
pub mod tests {

    use serde_json::json;

    use super::*;
    use crate::collector::tests::{TEST_COLLECTOR_WITHOUT_SCORE, TEST_COLLECTOR_WITH_SCORE};
    use crate::index::Index;
    use crate::query::{EnableScoring, QueryParser, Weight};
    u
    
    pub fn test_phrase_slop() -> crate::Result<()> {
        let index = create_index(&["a x b c"])?;
        let scores = test_query(1, &index, vec!["a", "b", "c"]);
        assert_eq!(scores.len(), 1);

        let index = create_index(&["a x b x c"])?;
        let scores = test_query(1, &index, vec!["a", "b", "c"]);
        assert_eq!(scores.len(), 0);

        let index = create_index(&["a b"])?;
        let scores = test_query(1, &index, vec!["b", "a"]);
        assert_eq!(scores.len(), 0);

        let index = create_index(&["a b"])?;
        let scores = test_query(2, &index, vec!["b", "a"]);
        assert_eq!(scores.len(), 1);

        Ok(())
    }