syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"fn_def_id:"}]}
source_snippet:                 fn_def_id: fn_def_id.to_def_id(),
context_before:             data: ty::AssocTypeData::Rpitit(ImplTraitInTraitData::Trait {
context_after:                 opaque_def_id: opaque_ty_def_id.to_def_id(),