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Unfold<St, F>: Debug without F: Debug

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This commit is contained in:
Simon Sapin 2018-11-15 13:21:25 +01:00
parent 48aae09e9f
commit 544ad37753
1 changed files with 10 additions and 1 deletions
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11
src/libcore/iter/sources.rs
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@ -444,7 +444,7 @@ pub fn unfold<St, T, F>(initial_state: St, f: F) -> Unfold<St, F>
/// See its documentation for more.
///
/// [`unfold`]: fn.unfold.html
#[derive(Copy, Clone, Debug)]
#[derive(Copy, Clone)]
#[unstable(feature = "iter_unfold", issue = /* FIXME */ "0")]
pub struct Unfold<St, F> {
state: St,
@ -462,3 +462,12 @@ impl<St, T, F> Iterator for Unfold<St, F>
(self.f)(&mut self.state)
}
}
#[unstable(feature = "iter_unfold", issue = /* FIXME */ "0")]
impl<St: fmt::Debug, F> fmt::Debug for Unfold<St, F> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("Unfold")
.field("state", &self.state)
.finish()
}
}