{"ast_node_type":"variable","tokens":[{"end":34,"kind":"keyword","start":0,"text":"let"}]}
        let hash = hash_ptr(&ptr);
    fn try_erased_ast_id(&self, ptr: SyntaxNodePtr) -> Option<ErasedFileAstId> {
        let idx = *self.ptr_map.find(hash, |&idx| self.arena[idx].0 == ptr)?;