syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"while"}]}
source_snippet:         while !self.eq_ctxt(other) {
context_before:     pub fn find_ancestor_in_same_ctxt(mut self, other: Span) -> Option<Span> {
context_after:             self = self.parent_callsite()?;