Indented code blocks can have further indented code sub-blocks.

[amatus]

When trying to format a code block that has indented lines surrounded by blank lines indented inside a list item, the blank-line-surrounded-indented-code ends up in a code sub-block.

Example:

1. Some code

        if (1) {

                printf("what?\n");
        }

2. Some other code
    ~~~
    while(0) {

            exit(-1);
    }
    ~~~

The if and while blocks are correctly contained in a code block which is part of their respective list items, but the printf and exit lines are surrounded by their own <pre><code></code></pre> tags because they are surrounded by blank lines and are indented an additional 8 spaces.