syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"structurally_relate_aliases:"}]}
source_snippet:         structurally_relate_aliases: StructurallyRelateAliases,
context_before:         infcx: &'infcx Infcx,
context_after:         ambient_variance: ty::Variance,