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-rw-r--r--components/layout/model.rs5
1 files changed, 4 insertions, 1 deletions
diff --git a/components/layout/model.rs b/components/layout/model.rs
index 4e4e5cad399..a031a5b0537 100644
--- a/components/layout/model.rs
+++ b/components/layout/model.rs
@@ -18,6 +18,7 @@ use std::cmp::{max, min};
use std::fmt;
/// A collapsible margin. See CSS 2.1 § 8.3.1.
+#[deriving(Copy)]
pub struct AdjoiningMargins {
/// The value of the greatest positive margin.
pub most_positive: Au,
@@ -60,6 +61,7 @@ impl AdjoiningMargins {
}
/// Represents the block-start and block-end margins of a flow with collapsible margins. See CSS 2.1 § 8.3.1.
+#[deriving(Copy)]
pub enum CollapsibleMargins {
/// Margins may not collapse with this flow.
None(Au, Au),
@@ -237,6 +239,7 @@ impl MarginCollapseInfo {
}
}
+#[deriving(Copy)]
pub enum MarginCollapseState {
AccumulatingCollapsibleTopMargin,
AccumulatingMarginIn,
@@ -322,7 +325,7 @@ impl IntrinsicISizesContribution {
}
/// Useful helper data type when computing values for blocks and positioned elements.
-#[deriving(PartialEq, Show)]
+#[deriving(Copy, PartialEq, Show)]
pub enum MaybeAuto {
Auto,
Specified(Au),