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diff --git a/servo/components/style/values/generics/flex.rs b/servo/components/style/values/generics/flex.rs
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+++ b/servo/components/style/values/generics/flex.rs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+//! Generic types for CSS values related to flexbox.
+
+/// A generic value for the `flex-basis` property.
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    MallocSizeOf,
+    Parse,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToAnimatedValue,
+    ToAnimatedZero,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C)]
+pub enum GenericFlexBasis<S> {
+    /// `content`
+    Content,
+    /// `<width>`
+    Size(S),
+}
+
+pub use self::GenericFlexBasis as FlexBasis;