libsyntax: Refactor deriving to reduce boilerplate required & derive Ord, TotalOrd and TotalEq#5640

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huonw wants to merge 7 commits intorust-lang:incomingfrom

huonw:syntax-generalise-deriving

Commits on Apr 12, 2013

libsyntax: abstract most of the deriving boilerplate into a simpler(r) interface.
huonw
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libcore: combine cmp::Ordering instances in lexical order.
huonw
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libsyntax: derive Clone, Eq, TotalEq, Ord, TotalOrd with the new generic deriving code.
huonw
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testsuite: add tests for derived Eq, TotalEq, Ord, TotalOrd.
huonw
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libsyntax: short-circuit on non-matching variants in deriving code.
huonw
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libsyntax: (maybe) fix deriving(TotalOrd) on windows
huonw
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libsyntax: another fix for deriving on windows.
huonw
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