{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"//"}]}
    // the relative offset between the cursor and the *identifier* token we are completing on
    let fake_ident_token = speculative_file.token_at_offset(offset).right_biased()?;
    let relative_offset = offset - fake_ident_token.text_range().start();