syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":".map(ty::ExistentialPredicate::AutoTrait)"}]}
source_snippet:                                     .map(ty::ExistentialPredicate::AutoTrait)
context_before:                                     .auto_traits()
context_after:                                     .map(ty::Binder::dummy),