syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // 2. If not, we've at least simplified things (e.g., we went
context_before:             //    THAT type.
context_after:             //    from `Vec?0>: WF` to `?0: WF`), so we can