syntax_data: {"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"infcx.tcx.def_span(specializing_impl_def_id),"}]}
source_snippet:             infcx.tcx.def_span(specializing_impl_def_id),
context_before:         infcx.dcx().span_delayed_bug(
context_after:             format!("failed to fully normalize {specializing_impl_trait_ref}"),