Function calcit_runner::runner::preprocess::preprocess_defn

pub fn preprocess_defn(
    head: &CalcitSyntax, 
    head_ns: &str, 
    args: &CalcitItems, 
    scope_defs: &HashSet<String>, 
    file_ns: &str, 
    program_code: &ProgramCodeData, 
    check_warnings: &RefCell<Vec<String>>
) -> Result<Calcit, CalcitErr>