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[WIP] Implement DST coercions.#23785

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Commits on Mar 25, 2015

• Revert obsoleted changes rust-lang#14830 made to MethodCall.

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• Move AutoUnsizeUniq from autorefs to a simple AdjustUnsize.

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• Hoist lvalue unsizing from AutoRef to AutoDerefRef.

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• Remove AdjustReifyFnPointer's unnecessary DefId field.

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• Do not use recursive storage for unsizing and autoref coercions.

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• Perform unsizing coercions only on pointers, not on lvalues and Box.

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• Drive unsizing coercions using just the target pointer type.

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• Forbid object types with incomplete projections, before coercions.

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Commits on Mar 27, 2015

• Introduce a built-in Unsize trait and use it for unsizing in coercions.

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• Introduce a CoerceUnsized trait and use it for custom coercions.

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• Implement {size,min_align}_of_val and drop_in_place intrinsics.

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• Add DST support to Rc.

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