syntax_data: {"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let path_kind = Self::cycle_path_kind(&self.stack, step_kind_from_parent, head);
context_before:         // in case we're in the first fixpoint iteration for this goal.
context_after:         debug!(?path_kind, "encountered cycle with depth {head:?}");