Function replace_symbol_body 

pub fn replace_symbol_body(
    workspace: &Workspace,
    db_path: &Path,
    conn: &Connection,
    symbol_name: &str,
    file_path: &str,
    new_body: &str,
    expected_body_hash: Option<&str>,
) -> Result<EditResult, EditError>

Atomically replaces the implementation body of a symbol by name.