{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"//"}]}
    // If a region is improperly ordered (end < start), `llvm-cov` will exit
    let end_col_has_high_bit_unset = (end_col & (1 << 31)) == 0;
    // with a fatal error, which is inconvenient for users and hard to debug.