       class: 'fail',
            comment: 'double hline produce double lines',
            latex: `\\begin{array}{c|c||c}
                1 & 2 & a\\\\
                \\hline 3 & 4 & b\\\\
                5 & 6 \\\\
                \\hline \\hline 5 & 6 & c\\\\
            \\end{array}}`,
          },
          {
            title: 'Array with Lines (invalid)',
            class: 'fail',
            comment: '`\\hline` not at the start of a line produces an error',
            latex: `\\begin{array}{c|c}
