I have this single line in my ~/.emacs:

(add-hook 'prog-mode-hook 'auto-fill-mode)

Now I open a foo.c with Emacs and type this code. I only type the code and enter. I do not type any tab. This is the indentation I get:

int main()
  for (;;) {
    printf("hello, world\n");

Why did Emacs indent my code like this?

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