How do I add Markdown formatting in a code / pre block?

Question

This may seem to defeat the purpose of a code block, but I\'d like to be able to bold something within a code block. For example, if I wanted to bold the return line:

Answer 1

You would have to do this in HTML, by design.

However, inside Markdown code spans and blocks, angle brackets and ampersands are always encoded automatically.

int main(void) {
    return 0;
}