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add default FromIterator for types with Default and Extend trait #143996

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add default FromIterator for types with Default and Extend trait #143996

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1653767
feat(lib:core:iter): add default impl for type with Default and Exten…
HernandoR Jul 16, 2025
8497fe1
Update collect.rs
HernandoR Jul 16, 2025
e9fba68
update collect.rs
HernandoR Jul 16, 2025
0950efc
chore swap A and T
HernandoR Jul 16, 2025
2a9c2d3
remove feature gate
HernandoR Jul 16, 2025
3ca979e
use specialization
HernandoR Jul 16, 2025
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2 changes: 1 addition & 1 deletion library/core/src/iter/traits/collect.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -153,8 +153,8 @@ pub trait FromIterator<A>: Sized {
}

// 为同时实现 Default 和 Extend 的类型实现 FromIterator
#[unstable(feature = "from_iter_default", issue = "58659")]
impl<T, A: Default + Extend<T>> FromIterator<T> for A {
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_diagnostic_item = "from_iter_default"]
default fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
let mut collection = A::default();
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