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authorbors <bors@rust-lang.org>2015-01-16 13:10:59 +0000
committerbors <bors@rust-lang.org>2015-01-16 13:10:59 +0000
commitee2bfae011e368e224d6d4f4c9fad13606ee99da (patch)
tree189eebe03c5b7fba71d429db8e0561a45d1317cb /src/libstd/sys/unix/stack_overflow.rs
parentf3d71be65cccfddd232e733c11129ed53961f980 (diff)
parentcb852239033baf4f44ab448f27127d6ab906c7c0 (diff)
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auto merge of #20972 : FlaPer87/rust/oibit-send-and-friends, r=nikomatsakis
This PR adds rules for negative implementations. It follows pretty much what the [RFC](https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md) says with 1 main difference:

Instead of positive implementations override negative implementations, this have been implemented in a way that a negative implementation of `Trait` for `T` will overlap with a positive implementation, causing a coherence error.

@nikomatsakis r?

cc #13231

[breaking-change]
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