library: use copied instead of manual map

Author: DaniPopes

library/core/src/array/mod.rs

@@ -206,7 +206,7 @@ where
 
     #[inline]
     fn try_from(slice: &[T]) -> Result<[T; N], TryFromSliceError> {
-        <&Self>::try_from(slice).map(|r| *r)
+        <&Self>::try_from(slice).copied()
     }
 }
 

library/core/src/iter/adapters/copied.rs

@@ -193,7 +193,7 @@ where
     T: Copy,
 {
     default fn spec_next_chunk(&mut self) -> Result<[T; N], array::IntoIter<T, N>> {
-        array::iter_next_chunk(&mut self.map(|e| *e))
+        array::iter_next_chunk(&mut self.copied())
     }
 }