From: bors <bors@rust-lang.org>
Date: Wed, 24 Jan 2018 15:05:11 +0000 (+0000)
Subject: Auto merge of #4972 - varkor:lazy-cell-unused-unsafe, r=alexcrichton
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Auto merge of #4972 - varkor:lazy-cell-unused-unsafe, r=alexcrichton

Allow unused_unsafe in LazyCell in preparation for lib change

https://github.com/rust-lang/rust/pull/47204 makes `UnsafeCell::into_inner` safe, which means `LazyCell::into_inner` will no longer need an `unsafe` block. `LazyCell` is a blocker for the change in Rust: this fix should allow the change to take place.
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b1c3e781ec4053f10534c1bf9e7e0a603befed45