syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"data:"}]}
source_snippet:             data: ty::AssocTypeData::Rpitit(ImplTraitInTraitData::Trait {
context_before:         kind: ty::AssocKind::Type {
context_after:                 fn_def_id: fn_def_id.to_def_id(),