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rustc: fixed regionck for owned trait casts. #13129

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rustc: fixed regionck for owned trait casts. #13129

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Commits on Apr 8, 2014

  1. rustc: fixed regionck for owned trait casts. 

    Regionck didn't do any checks for casts/coercions to an owned trait,
which resulted in lifetimes of the source pointer
to be ignored in the result of such cast.

This fix constraints all regions of the source type of the cast/coercion to be superregions
of each region of the target type (if target trait definition has some lifetime params),
or of 'static lifetime (if there're no lifetime params in target trait's definition).

Closes rust-lang#5723
Closes rust-lang#9745
Closes rust-lang#11971
    @dmski
    dmski committed Apr 8, 2014
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