syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"\"hir,identified\""}]}
source_snippet:         "hir,identified" => Hir(PpHirMode::Identified),
context_before:         "hir" => Hir(PpHirMode::Normal),
context_after:         "hir,typed" => Hir(PpHirMode::Typed),