syntax_data: {"ast_node_type":"variable","tokens":[{"end":64,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // or `let temp = <Ty as DerefMut>::deref_mut(ref_src);`
context_before:         // `let temp = <Ty as Deref>::deref(ref_src);`
context_after:         self.cfg.terminate(