Ralf Jung c3abb82908
Rollup merge of #76135 - CDirkx:const-option, r=dtolnay,oli-obk
Stabilize some Option methods as const

Stabilize the following methods of `Option` as const:
 - `is_some`
 - `is_none`
 - `as_ref`

These methods are currently const under the unstable feature `const_option` (tracking issue: #67441).
I believe these methods to be eligible for stabilization because of the stabilization of #49146 (Allow if and match in constants) and the trivial implementations, see also:  [PR#75463](https://github.com/rust-lang/rust/pull/75463).

Related: #76225
2020-09-21 10:40:26 +02:00
..

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For more information on how various parts of the compiler work, see the rustc dev guide.