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-rw-r--r--components/selectors/parser.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/components/selectors/parser.rs b/components/selectors/parser.rs
index dead7875d0f..99b73353abf 100644
--- a/components/selectors/parser.rs
+++ b/components/selectors/parser.rs
@@ -84,7 +84,7 @@ macro_rules! with_all_bounds {
/// are parameterized on SelectorImpl. See
/// <https://github.com/rust-lang/rust/issues/26925>
pub trait SelectorImpl: Clone + Sized + 'static {
- type ExtraMatchingData: Sized + 'static;
+ type ExtraMatchingData: Sized + Default + 'static;
type AttrValue: $($InSelector)*;
type Identifier: $($InSelector)* + PrecomputedHash;
type ClassName: $($InSelector)* + PrecomputedHash;