syntax_data: {"ast_node_type":"other","tokens":[{"end":25,"kind":"keyword","start":0,"text":"DefKind::OpaqueTy"}]}
source_snippet:         DefKind::OpaqueTy
context_before:         DefKind::AssocTy | DefKind::TyAlias | DefKind::GlobalAsm => {}
context_after:         | DefKind::Mod