syntax_data: {"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let rhs = self.mirror_expr(rhs);
context_before:                     let lhs = self.mirror_expr(lhs);
context_after:                     self.overloaded_operator(expr, Box::new([lhs, rhs]))