bors a3257804df auto merge of #15406 : luqmana/rust/nop, r=pcwalton
Extend the null ptr optimization to work with slices, closures, procs, & trait objects by using the internal pointers as the discriminant.

This decreases the size of `Option<&[int]>` (and similar) by one word.
2014-07-08 00:31:42 +00:00
..
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2014-07-04 11:20:54 +10:00
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