syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // `HirId` that is located within the context where the closure appears (and, sadly,
context_before:     /// Note that closures have a `DefId`, but the closure *expression* also has a
context_after:     // a corresponding `NodeId`, since those are not yet phased out). The parent of