Add an explicit bounds check in move_index
#353
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It did already panic as expected, but with a confusing message if the `to` index was out of bounds. Now we have a direct bounds check for that at the start, just as there already was for the `from` index.
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It did already panic as expected, but with a confusing message if the
toindex was out of bounds. Now we have a direct bounds check for that at the start, just as there already was for thefromindex.