desugaring-based box placement-in (take-4 branch)#26180

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pnkfelix wants to merge 36 commits intorust-lang:masterfrom

pnkfelix:fsk-box-placer-take-4

Commits on Jul 16, 2015

Added `Box<_>` type annotations where necessary for overloaded-box.
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prototype Placer protocol for unstable overloaded-box and placement-in.
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Add feature-gates for desugaring-based `box` and placement-`in`.
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Accommodate error message explosion from box-desugaring in some tests.
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Update tests for desugaring box and placement-in.
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Issue 22450: Address desugaring-box problems in [pretty] run-pass test suite.
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Workaround issue 22462 by moving static `value` into its own module.
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update alloc::boxed post rebase.
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update liballoc/lib.rs post rebase.
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Hack for "unsafety hygiene" -- `push_unsafe!` and `pop_unsafe!` track depth.
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Change signature for `move_val_init` intrinsic to take `*mut T` for `dest`.
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Avoid feature-warnings on stage0.
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Revise placement-in expansion to use `push/pop_unsafe` and `move_val_init`.
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call `push_compiler_expansion` during the `box` and placement-`in` expansions.
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turn on use of sugaring based `box EXPR` in parser.
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Instrument `rustc::middle::stability::maybe_do_stability_checking`
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Add `Box::new` in spots where new box protocol needs help with inference.
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Allow unstable code to be injected by `box` and placement-`in` expansions.
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librustc: Replace `box` with `Box::new` to assist inference for box protocol.
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librustc_driver: Replace `box` with `Box::new` to assist inference for box protocol.
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librustc_lint: Replace `box` with `Box::new` to assist inference for box protocol.
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librustc_trans: Replace `box` with `Box::new` to assist inference for box protocol.
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librustc_llvm: Replace `box` with `Box::new` to assist inference for box protocol.
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librustdoc: Replace `box` with `Box::new` to assist inference for box protocol.
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switch to `box expr` form in liblog.
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Add `Box<_>` annotations to run-pass tests for box protocol.
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Switched to `Box::new` in run-fail test.
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Accommodate box protocol in compile-fail tests.
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add some (potentially unnecessary) `#[inline] annotations in `alloc::boxed`.
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accommodate `box` protocol in `run-pass-valgrind`.
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Remove dependences on `box`-protocol from run-pass-fulldeps.
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Fix `box`-protocol for run-make tests.
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Placate tidy, mostly in test suite code.
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Placate box protocol by switching to `Box::new` in various test code.
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Revise lang_item demo to something unrelated to Box impl
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revert back to the old syntax while landing the protocol alone.
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