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 source_callsite(self) -> Span {
context_after:         if !ctxt.is_root() { ctxt.outer_expn_data().call_site.source_callsite() } else { self }