syntax_data: {"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"\"hir\""}]}
source_snippet:         "hir" => Hir(PpHirMode::Normal),
context_before:         "ast-tree,expanded" => AstTreeExpanded,
context_after:         "hir,identified" => Hir(PpHirMode::Identified),