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Limit TrustedLen impls to core types

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This commit is contained in:
Jacob Pratt
2021-04-01 01:55:03 -04:00
parent 47a90f4520
commit 641c8cd875
1 changed files with 21 additions and 6 deletions
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library/core/src/iter/range.rs
+21 -6
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@@ -655,8 +655,13 @@ fn nth_back(&mut self, n: usize) -> Option<A> {
}
}
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<A: Step> TrustedLen for ops::Range<A> {}
macro_rules! impl_trusted_len_for_range {
($($type:ty)*) => {$(
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl TrustedLen for ops::Range<$type> {}
)*}
}
impl_trusted_len_for_range![char i8 i16 i32 i64 i128 isize u8 u16 u32 u64 u128 usize];
#[stable(feature = "fused", since = "1.26.0")]
impl<A: Step> FusedIterator for ops::Range<A> {}
@@ -687,8 +692,13 @@ fn nth(&mut self, n: usize) -> Option<A> {
#[stable(feature = "fused", since = "1.26.0")]
impl<A: Step> FusedIterator for ops::RangeFrom<A> {}
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<A: Step> TrustedLen for ops::RangeFrom<A> {}
macro_rules! impl_trusted_len_for_range_from {
($($type:ty)*) => {$(
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl TrustedLen for ops::RangeFrom<$type> {}
)*}
}
impl_trusted_len_for_range_from![char i8 i16 i32 i64 i128 isize u8 u16 u32 u64 u128 usize];
#[stable(feature = "inclusive_range", since = "1.26.0")]
impl<A: Step> Iterator for ops::RangeInclusive<A> {
@@ -899,8 +909,13 @@ fn ok<B, T>(mut f: impl FnMut(B, T) -> B) -> impl FnMut(B, T) -> Result<B, !> {
}
}
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<A: Step> TrustedLen for ops::RangeInclusive<A> {}
macro_rules! impl_trusted_len_for_range_inclusive {
($($type:ty)*) => {$(
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl TrustedLen for ops::RangeInclusive<$type> {}
)*}
}
impl_trusted_len_for_range_inclusive![char i8 i16 i32 i64 i128 isize u8 u16 u32 u64 u128 usize];
#[stable(feature = "fused", since = "1.26.0")]
impl<A: Step> FusedIterator for ops::RangeInclusive<A> {}