syntax_data: {"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let arg = self.mirror_expr(arg);
context_before:                 if self.typeck_results.is_method_call(expr) {
context_after:                     self.overloaded_place(expr, expr_ty, None, Box::new([arg]), expr.span)