syntax_data: {"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut call_site_ctxt = if transparency == Transparency::SemiOpaque {
context_before:         let call_site_ctxt = self.expn_data(expn_id).call_site.ctxt();
context_after:             self.normalize_to_macros_2_0(call_site_ctxt)