syntax_data: {"ast_node_type":"variable","tokens":[{"end":27,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let tcx = self.tcx;
context_before:     fn make_mirror_unadjusted(&mut self, expr: &'tcx hir::Expr<'tcx>) -> Expr<'tcx> {
context_after:         let expr_ty = self.typeck_results.expr_ty(expr);