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Auto merge of #87237 - jonas-schievink:const-for-and-try, r=oli-obk

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Add feature gates for `for` and `?` in consts

These operations seems *relatively* straightforward to support, and only seem to be blocked on `impl const Trait`.

I have included a working test for `const_try`, but `const_for` is currently unusable without reimplementing *every single* defaulted `Iterator` method, so I didn't do that.

(both features still need tracking issues before this is merged)
This commit is contained in:
bors 2021-07-30 12:05:48 +00:00
commit 87dc824248
19 changed files with 162 additions and 34 deletions
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6
compiler/rustc_feature/src/active.rs
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@ -677,6 +677,12 @@ declare_features! (
/// Allows `#[derive(Default)]` and `#[default]` on enums.
(active, derive_default_enum, "1.56.0", Some(86985), None),
/// Allows `for _ in _` loops in const contexts.
(active, const_for, "1.56.0", Some(87575), None),
/// Allows the `?` operator in const contexts.
(active, const_try, "1.56.0", Some(74935), None),
// -------------------------------------------------------------------------
// feature-group-end: actual feature gates
// -------------------------------------------------------------------------