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Auto merge of #76136 - CDirkx:const-result, r=dtolnay

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Stabilize some Result methods as const

Stabilize the following methods of Result as const:
 - `is_ok`
 - `is_err`
 - `as_ref`

A test is also included, analogous to the test for `const_option`.

These methods are currently const under the unstable feature `const_result` (tracking issue: #67520).
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) and [PR#76135](https://github.com/rust-lang/rust/pull/76135).

Note: these methods are the only methods currently under the `const_result` feature, thus this PR results in the removal of the feature.

Related: #76225
This commit is contained in:
bors
2020-09-20 13:07:11 +00:00
parent 41507ed0d5 bf70e21a7e
commit b873fa6d42
10 changed files with 116 additions and 191 deletions
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library/core/src/lib.rs
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@@ -87,7 +87,6 @@
#![feature(const_ptr_offset)]
#![feature(const_ptr_offset_from)]
#![feature(const_raw_ptr_comparison)]
#![feature(const_result)]
#![feature(const_slice_from_raw_parts)]
#![feature(const_slice_ptr_len)]
#![feature(const_size_of_val)]