syntax_data: {"ast_node_type":"variable","tokens":[{"end":31,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let ctxt = self.ctxt();
context_before:     pub fn parent_callsite(self) -> Option<Span> {
context_after:         (!ctxt.is_root()).then(|| ctxt.outer_expn_data().call_site)