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style: Ensure the flusher is completely consumed before getting dropped.

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This will be necessary for future patches.

MozReview-Commit-ID: FgWaoRCMdw2
Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>
This commit is contained in:
Emilio Cobos Álvarez 2017-08-22 15:57:13 +02:00
parent 15594dda10
commit 1c67a7dc14
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1 changed files with 14 additions and 0 deletions
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14
components/style/stylesheet_set.rs
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@ -90,6 +90,20 @@ where
}
}
#[cfg(debug_assertions)]
impl<'a, 'b, S> Drop for StylesheetFlusher<'a, 'b, S>
where
'b: 'a,
S: StylesheetInDocument + PartialEq + 'static,
{
fn drop(&mut self) {
debug_assert!(
self.iter.next().is_none(),
"You're supposed to fully consume the flusher",
);
}
}
impl<'a, 'b, S> Iterator for StylesheetFlusher<'a, 'b, S>
where
'b: 'a,