{"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
                let rhs = self.evaluated[rhs].as_ref()?;
                let lhs = self.ecx.read_immediate(lhs).discard_err()?;
                let rhs = self.ecx.read_immediate(rhs).discard_err()?;