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Make Default const and add some const Default impls #134628

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Make Default const and add some const Default impls #134628

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estebank
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Full list of impl const Default types:

  • ()
  • bool
  • char
  • std::ascii::Char
  • usize
  • u8
  • u16
  • u32
  • u64
  • u128
  • i8
  • i16
  • i32
  • i64
  • i128
  • f16
  • f32
  • f64
  • f128
  • std::marker::PhantomData
  • Option
  • std::iter::Empty
  • std::ptr::Alignment
  • &[T]
  • &mut [T]
  • &str
  • &mut str
  • String
  • Vec

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rustbot commented Dec 21, 2024

r? @wesleywiser

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Dec 21, 2024
@estebank
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Made this for some experiments with default field values, might as well put it somewhere visible as it seems like an obvious next step for the const traits effort.

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Please make sure this is assigned to someone on @rust-lang/project-const-traits if you take this out of draft.

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bors commented Dec 24, 2024

☔ The latest upstream changes (presumably #134716) made this pull request unmergeable. Please resolve the merge conflicts.

@estebank
Make Default const and add some const Default impls
d572a90 
Full list of `impl const Default` types:

- ()
- bool
- char
- std::ascii::Char
- usize
- u8
- u16
- u32
- u64
- u128
- i8
- i16
- i32
- i64
- i128
- f16
- f32
- f64
- f128
- std::marker::PhantomData<T>
- Option<T>
- std::iter::Empty<T>
- std::ptr::Alignment
- &[T]
- &mut [T]
- &str
- &mut str
- String
- Vec<T>
@estebank
Update tests
4f6558b
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r? @oli-obk

Let me know what would be needed to make this merge-ready.

@rustbot rustbot assigned oli-obk and unassigned wesleywiser Dec 25, 2024
@fee1-dead fee1-dead mentioned this pull request Dec 30, 2024
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I'd like to block this on #133999.

@fee1-dead fee1-dead added the S-blocked Status: Blocked on something else such as an RFC or other implementation work. label Dec 30, 2024
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@estebank @rustbot @compiler-errors @rust-log-analyzer @bors @fee1-dead @oli-obk @wesleywiser