Implement unique types per fn item, rather than having all fn items have fn pointer type#19891

Merged

bors merged 13 commits intorust-lang:masterfrom nikomatsakis:unique-fn-types-3

Dec 23, 2014

+548-272

Commits on Dec 22, 2014

Introduce a tcx() helper method to cleanup this mess.
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Make ty_bare_fn carry an optional def-id indicating whether it is the
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Rote changes that don't care to distinguish between a fn pointer and a fn item.
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Adjust metadata for new fields and enum variants. Yawn.
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Insert FIXME links to issue rust-lang#19925 : fn item types should be zero-sized.
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Perform coercions on LHS assignments.
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Fix fallout from changes. In cases where stage0 compiler is needed, we
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Insert coercions to fn pointer types required for the new types
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Various simple tests for fn item type vs fn pointer type and for coercions between them.
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Change print out to include the path to the fn, a bit ad-hoc for now .
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Address nit.
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Correct merge failure around imports in str.rs.
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Tweak region-related error messages that changed slightly due to coercion
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