Rollup merge of #50667 - alexcrichton:no-remove-extern-crate-unless-works, r=Manishearth

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rustc: Only suggest deleting `extern crate` if it works

This commit updates one of the edition lints to only suggest deleting `extern
crate` if it actually works. Otherwise this can yield some confusing behavior
with rustfix specifically where if you accidentally deny the `rust_2018_idioms`
lint in the 2015 edition it's suggesting features that don't work!

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kennytm 2018-05-13 16:15:47 +08:00

parent 34cec066d9 12f92e9640

commit ededa9dcd5

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