syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"CollectionMode::ImplTraitInAssocTypes"}]}
source_snippet:                 CollectionMode::ImplTraitInAssocTypes
context_before:             DefKind::AssocConst | DefKind::AssocFn | DefKind::AssocTy => {
context_after:             }