syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"specializing_impl_trait_header.trait_ref.instantiate_identity();"}]}
source_snippet:         specializing_impl_trait_header.trait_ref.instantiate_identity();
context_before:     let specializing_impl_trait_ref =
context_after:     let cause = &ObligationCause::dummy();