{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"//"}]}
    // that requires the optimized/ctfe MIR, coroutine bodies, or evaluating consts.
    // in MIR optimizations that may only be reachable through codegen, or other codepaths
    if tcx.sess.opts.unstable_opts.validate_mir {