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bbfa235
(Get the code!)
(In reply to Richard Biener from comment #1)
> The testcase is violating strict-aliasing rules as you access a struct head
> as struct node here:
Agree with ghudson here: n->prev points to &heads[2], not &heads[0].
Although assigning a casted struct head * to a struct node * is arguably sloppy, the standard does not prohibit it, as long as it is never dereferenced in that form.