syntax_data: {"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"self.overloaded_operator(expr,"}]}
source_snippet:                     self.overloaded_operator(expr, Box::new([arg]))
context_before:                     let arg = self.mirror_expr(arg);
context_after:                 } else if let hir::ExprKind::Lit(lit) = arg.kind {