diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 28fc6d45e6..f184727ced 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -566,6 +566,29 @@ jobs:
 
       - run: cargo test
 
+  # We want to ensure that the cargo benchmarks still compile, which requires a
+  # nightly compiler.
+  cargo-bench:
+    if: ${{ needs.changes.outputs.rust == 'true' }}
+    runs-on: ubuntu-latest
+    needs:
+      - linting-done
+      - changes
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Rust
+        # There don't seem to be versioned releases of this action per se: for each rust
+        # version there is a branch which gets constantly rebased on top of master.
+        # We pin to a specific commit for paranoia's sake.
+        uses: dtolnay/rust-toolchain@e645b0cf01249a964ec099494d38d2da0f0b349f
+        with:
+            toolchain: nightly-2022-12-01
+      - uses: Swatinem/rust-cache@v2
+
+      - run: cargo bench --no-run
+
   # a job which marks all the other jobs as complete, thus allowing PRs to be merged.
   tests-done:
     if: ${{ always() }}
@@ -577,6 +600,7 @@ jobs:
       - portdb
       - complement
       - cargo-test
+      - cargo-bench
     runs-on: ubuntu-latest
     steps:
       - uses: matrix-org/done-action@v2
@@ -588,3 +612,4 @@ jobs:
           skippable: |
             lint-newsfile
             cargo-test
+            cargo-bench
diff --git a/changelog.d/14943.feature b/changelog.d/14943.feature
new file mode 100644
index 0000000000..8293e99eff
--- /dev/null
+++ b/changelog.d/14943.feature
@@ -0,0 +1 @@
+Experimental support for [MSC3952](https://github.com/matrix-org/matrix-spec-proposals/pull/3952): intentional mentions.
diff --git a/rust/benches/evaluator.rs b/rust/benches/evaluator.rs
index 8c28bb0af3..6b16a3f75b 100644
--- a/rust/benches/evaluator.rs
+++ b/rust/benches/evaluator.rs
@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #![feature(test)]
+use std::collections::BTreeSet;
 use synapse::push::{
     evaluator::PushRuleEvaluator, Condition, EventMatchCondition, FilteredPushRules, PushRules,
 };
@@ -32,6 +33,8 @@ fn bench_match_exact(b: &mut Bencher) {
 
     let eval = PushRuleEvaluator::py_new(
         flattened_keys,
+        BTreeSet::new(),
+        false,
         10,
         Some(0),
         Default::default(),
@@ -68,6 +71,8 @@ fn bench_match_word(b: &mut Bencher) {
 
     let eval = PushRuleEvaluator::py_new(
         flattened_keys,
+        BTreeSet::new(),
+        false,
         10,
         Some(0),
         Default::default(),
@@ -104,6 +109,8 @@ fn bench_match_word_miss(b: &mut Bencher) {
 
     let eval = PushRuleEvaluator::py_new(
         flattened_keys,
+        BTreeSet::new(),
+        false,
         10,
         Some(0),
         Default::default(),
@@ -140,6 +147,8 @@ fn bench_eval_message(b: &mut Bencher) {
 
     let eval = PushRuleEvaluator::py_new(
         flattened_keys,
+        BTreeSet::new(),
+        false,
         10,
         Some(0),
         Default::default(),
@@ -156,6 +165,7 @@ fn bench_eval_message(b: &mut Bencher) {
         false,
         false,
         false,
+        false,
     );
 
     b.iter(|| eval.run(&rules, Some("bob"), Some("person")));