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Note some previous attempts to change the Default impl for [T; 0] #146533

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Merged
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Sep 16, 2025
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Note some previous attempts to change the Default impl for [T; 0] #146533

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5 changes: 5 additions & 0 deletions library/core/src/array/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -472,6 +472,11 @@ impl<T: Copy> SpecArrayClone for T {
// The Default impls cannot be done with const generics because `[T; 0]` doesn't
// require Default to be implemented, and having different impl blocks for
// different numbers isn't supported yet.
//
// Trying to improve the `[T; 0]` situation has proven to be difficult.
// Please see these issues for more context on past attempts and crater runs:
// - https://github.com/rust-lang/rust/issues/61415
// - https://github.com/rust-lang/rust/pull/145457

macro_rules! array_impl_default {
{$n:expr, $t:ident $($ts:ident)*} => {
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