{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
        let _p = tracing::info_span!("source_file_to_def").entered();
    pub(super) fn source_file_to_def(&mut self, src: InFile<&ast::SourceFile>) -> Option<ModuleId> {
        let file_id = src.file_id.original_file(self.db);