`as_deref()` and `as_deref_mut()` impls#59628

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Commits on Apr 15, 2019

renamed `inner_deref` feature's `deref*()` methods `as_deref*()` as per discussion https://github.com/rust-lang/rust/issues/50264

Xandkeeper
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Brad Gibson
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added `deref_mut_*` versions of `inner_deref` methods as per discussion https://github.com/rust-lang/rust/issues/50264

Xandkeeper
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Brad Gibson
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fixed breaking changes

Xandkeeper
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Brad Gibson
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