Warning - Bug introduced in nightly since 2017-06-20

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There is a bug introduced in nightly 2017-06-20. (this does not impact stable).
You might want to consider sticking to 2017-06-18 for a while.

The issue is already tracked in #42903 .

The bug can be reproduced with the following code.

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Issue link for the lazy:
https://github.com/rust-lang/rust/issues/42903

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The issue has been fixed. Rejoice!

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