syntax_data: {"ast_node_type":"variable","tokens":[{"end":91,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let Some(result) = self.check_cycle_on_stack(cx, input, step_kind_from_parent) {
context_before:         // as it may reduce the number of `nested_goals` we need to track.
context_after:             debug_assert!(validate_cache.is_none(), "global cache and cycle on stack: {input:?}");