{"ast_node_type":"variable","tokens":[{"end":43,"kind":"keyword","start":0,"text":"let"}]}
    let edition = file_id.edition(sema.db);
    let InFile { file_id, value: def_source } = module.definition_source(sema.db);
    let (new_name, kind) = IdentifierKind::classify(edition, new_name)?;