syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // versions at all anymore. We still support turning it off using -Zmutable-noalias.
context_before:             // (see #54878), so it was conditionally disabled, but we don't support earlier
context_after:             let noalias_mut_ref = tcx.sess.opts.unstable_opts.mutable_noalias;