syntax_data: {"ast_node_type":"variable","tokens":[{"end":87,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let size = ty::tls::with(|tcx| Integer::from_int_ty(&tcx, ity).size());
context_before:             ty::Int(ity) => {
context_after:                 let x = self.val;