md`
### ${tex`\LaTeX`} in a tex.block
#### While it is valid, we need to split out the prose as \`markdown\`
${tex.block`
% A '%' character causes TeX to ignore all remaining text on the line,
% and is used for comments like this one.
\LaTeX\ is good at typesetting mathematical formulas
like
x-3y + z = 7
`}
`