syntax_data: {"ast_node_type":"other","tokens":[{"end":21,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // for coherence.
context_before:     // specialization enabled, since it's not being specialized, and it's already been checked
context_after:     if !tcx.specialization_enabled_in(specializing_impl_def_id.krate) {