core: implement TrivialClone for arrays and Option

Author: joboet

library/core/src/array/mod.rs

@@ -427,6 +427,9 @@ impl<T: Clone, const N: usize> Clone for [T; N] {
     }
 }
 
+#[unstable(feature = "trivial_clone", issue = "none")]
+unsafe impl<T: TrivialClone, const N: usize> TrivialClone for [T; N] {}
+
 trait SpecArrayClone: Clone {
     fn clone<const N: usize>(array: &[Self; N]) -> [Self; N];
 }

library/core/src/option.rs

@@ -556,6 +556,7 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
+use crate::clone::TrivialClone;
 use crate::iter::{self, FusedIterator, TrustedLen};
 use crate::ops::{self, ControlFlow, Deref, DerefMut};
 use crate::panicking::{panic, panic_display};
@@ -2050,6 +2051,9 @@ where
     }
 }
 
+#[unstable(feature = "trivial_clone", issue = "none")]
+unsafe impl<T: TrivialClone> TrivialClone for Option<T> {}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T> Default for Option<T> {
     /// Returns [`None`][Option::None].