syntax_data: {"ast_node_type":"impl","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // but we have no substs for this impl since it's not really inheriting
context_before:         // we'll render this something like `<Ty as Trait>::method::inner_fn`
context_after:         // generics from the outer item. We need to use the identity substs, and