{"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
                let left_ty = dest.ty(&self.body.local_decls, self.tcx).ty;
                // LHS and RHS of the assignment must have the same type.
                let right_ty = rvalue.ty(&self.body.local_decls, self.tcx);