Update orphan and overlap rules for RFC 1023#23867

Merged

alexcrichton merged 6 commits intorust-lang:masterfrom

nikomatsakis:issue-23086-take-3

Apr 2, 2015

Commits on Apr 1, 2015

Implement the changes to coherence such that we consider a type to be
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Add `#[fundamental]` annotations into libcore so that `Sized` and the
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Update tests for new coherence rules, and add a swatch of new tests
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Fallout in libstd: remove impls now considered to conflict.
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Fallout in libsyntax/librustc: use newtype'd options for linked lists,
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Collect the definition of the `Error` trait into `libstd` for now. This
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