Something that has been on the list for aeons finally got implemented:

/* -*- c -*- */
#include <stdio.h>
int main(int argc, char **argv)
{
    int n;
    for (n = 0; n < 5; n++)
        printf("dongs\n");
    return 0;
}

This uses a real syntax parser (i.e., not the javascript crap that 4chan uses on /prog/), so you have to specify the language inside -*- markers for it to work, at least for now. Heuristics for common lanugages might be a future possibility.