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Revise lang_item demo to something unrelated to Box impl #22499

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Revise lang_item demo to something unrelated to Box impl #22499

wants to merge 1 commit into from

Commits on Mar 4, 2015

  1. Replace exchange_malloc/exchange_free demo with something unrelat… 

    …ed to Box.

Precursor for landing overloaded-`box`, since that will decouple the
`box` syntax from the exchange heap (and in fact will eliminate the
use of the two aforementioned lang items).

Instead, the new demonstration program shows a definition of the
`str_eq` lang item. (We do not have that many procedural lang-items to
choose from, which is a good sign for our efforts to decouple the
compiler from the runtime!)

(This previously used a demo of `panic_bounds_check`, but a `str_eq`
demonstration is both easier to code and arguably a more interesting
aspect of the language to discuss.)
    @pnkfelix
    pnkfelix committed Mar 4, 2015
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