syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:     if !tcx.specialization_enabled_in(specializing_impl_def_id.krate) {
context_before:     // for coherence.
context_after:         let span = tcx.def_span(specializing_impl_def_id);