syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if !span.allows_unstable(sym::specialization)
context_before:         let span = tcx.def_span(specializing_impl_def_id);
context_after:             && !span.allows_unstable(sym::min_specialization)