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Maybe, but you have to specifically opt-in to the nightly toolchain in order to compile something that uses it. It's not something that's included by default, or appropriate for use in production scenarios (unless you're willing to deal with the resulting breakage, of course).

Of course it's not suitable for production, but it was still quite common to look at a rust project and find that it used the nightly compiler.

It's been awhile, but if memory serves tons of stuff was using the nightly compiler.

So, yes buyer beware. But when the whole ecosystem does it...

Exactly. I think it's getting better now that some of the cool things people were waiting on have made it into the 2018 edition. Off-hand I know that Remacs switched from the nightlies to 2018.

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