syntax_data: {"ast_node_type":"other","tokens":[{"end":33,"kind":"keyword","start":0,"text":"}"}]}
source_snippet:                                 }
context_before:                                     Some((adt_def, adt_def.variant_index_with_ctor_id(ctor_id)))
context_after:                                 Res::SelfCtor(..) => Some((adt_def, FIRST_VARIANT)),