documentation about feature gates

[nikomatsakis]

I find myself referencing this forge article a lot:

https://forge.rust-lang.org/feature-guide.html
EDIT (mark-i-m): this moved to https://rust-lang.github.io/rustc-guide/implementing_new_features.html

It's ok, but not great. Some things I would like to see covered in rustc-guide instead (and then perhaps remove that article):

• how to add a feature gate in the code
  • how to add a test covering your feature gate
• how to change for simple syntactic things
• how to do more advanced gates by looking at sess.features.your_feature_here as a boolean

[mark-i-m]

Also, how to stabilize. And then maybe we can get rid of that forge article too...

[mark-i-m]

how to change for simple syntactic things

@nikomatsakis Could you clarify what you mean by this? Do you mean warning cycles and future compat lints?

[alecmocatta]

For anyone else coming here from google and looking for where the above link moved to: https://rust-lang.github.io/rustc-guide/implementing_new_features.html

[mark-i-m]

Thanks @alecmocatta
Updated above.

[mark-i-m]

@Centril Do you happen to know what the procedure is for this (from Niko's post above):

how to change for simple syntactic things

[Centril]

@mark-i-m It's documented in https://rust-lang.github.io/rustc-guide/implementing_new_features.html :)

[mark-i-m]

Oh, lol ok. I will close this issue then!