syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // Some consumers of rustc need to map MIR locations back to HIR nodes. Currently
context_before:             if self.tcx.sess.opts.unstable_opts.maximal_hir_to_mir_coverage {
context_after:                 // the only part of rustc that tracks MIR -> HIR is the