Add the `experimental_keywords` ability#2919

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Lokathor wants to merge 11 commits intorust-lang:masterfrom

Lokathor:gross-keywords

Commits on May 1, 2020

first draft of experiemental_keywords
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Address https://github.com/rust-lang/rfcs/pull/2919#discussion_r418366509
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clarify the rust playground future proposal
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Clarify that keyword form is intended to be available in all editions. https://rust-lang.zulipchat.com/#narrow/stream/213817-t-lang/topic/Making.20new.20.60_.23.60.20prefixes.20not.20a.20breaking.2…
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Add an alterantive where we could limit the experimentation to Nightly
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mention rustfix possibility
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sysroot possibilty
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