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Auto merge of #25676 - dmgawel:patch-1, r=huonw

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Earlier created vector `["Hello", "world"]` has two elements and we try to add a third element.
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bors 2015-05-21 13:00:04 +00:00
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@ -150,8 +150,8 @@ of those times. As the error explains, while we made our binding mutable, we
still cannot call `push`. This is because we already have a reference to an
element of the vector, `y`. Mutating something while another reference exists
is dangerous, because we may invalidate the reference. In this specific case,
when we create the vector, we may have only allocated space for three elements.
Adding a fourth would mean allocating a new chunk of memory for all those elements,
when we create the vector, we may have only allocated space for two elements.
Adding a third would mean allocating a new chunk of memory for all those elements,
copying the old values over, and updating the internal pointer to that memory.
That all works just fine. The problem is that `y` wouldn’t get updated, and so
we’d have a ‘dangling pointer’. That’s bad. Any use of `y` would be an error in