the feature rust_2018_preview is already implied by usage of 2018 edition.#3062

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matthiaskrgr wants to merge 2 commits intorust-lang:masterfrom

matthiaskrgr:R2018_implied

Commits on Aug 18, 2018

the feature rust_2018_preview is already implied by usage of 2018 edition.
matthiaskrgr
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mini-macro: remove use_extern_macros feature activation since it is stable since 1.30.
matthiaskrgr
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