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Rollup merge of #68810 - ollie27:once_with_copy, r=Dylan-DPC 

Remove Copy impl from OnceWith

Iterators typically don't implement `Copy` and this shouldn't be an exception.
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Dylan DPC 2020-02-04 21:51:53 +01:00 committed by GitHub
parent 4d6e2d81b8 5f689fe466
commit 94d6a96189
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src/libcore/iter/sources.rs
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@ -398,7 +398,7 @@ pub fn once<T>(value: T) -> Once<T> {
/// See its documentation for more.
///
/// [`once_with`]: fn.once_with.html
#[derive(Copy, Clone, Debug)]
#[derive(Clone, Debug)]
#[stable(feature = "iter_once_with", since = "1.43.0")]
pub struct OnceWith<F> {
gen: Option<F>,