syntax_data: {"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let infcx = tcx.infer_ctxt().build(ty::TypingMode::Analysis {
context_before: ) -> &'tcx ty::List<ty::ArgOutlivesPredicate<'tcx>> {
context_after:         defining_opaque_types_and_generators: ty::List::empty(),