diff --git a/crates/doc/src/eval.rs b/crates/doc/src/eval.rs
index 6756277d..4bf3fd26 100644
--- a/crates/doc/src/eval.rs
+++ b/crates/doc/src/eval.rs
@@ -1948,11 +1948,29 @@ fn path_at(segs: &[kernel::PathSeg], d: f64) -> (Vec3, Vec3) {
 }
 
 /// Apply transformed copies of the tools of `features` (patterns, mirrors).
-fn replay(doc: &Document, vals: &BTreeMap<String, Value>, f: &Feature, st: &mut ModelState, features: &[String], mats: &[Mat]) -> Result<()> {
+fn replay(
+    doc: &Document,
+    vals: &BTreeMap<String, Value>,
+    f: &Feature,
+    st: &mut ModelState,
+    features: &[String],
+    mats: &[Mat],
+    warning: &mut Option<String>,
+) -> Result<()> {
     if features.is_empty() {
         return Err(DocError::Invalid("no features selected".into()));
     }
-    for name in features {
+    // A suppressed feature has nothing to copy: its copies go with it.
+    let suppressed: Vec<&String> = features.iter().filter(|n| doc.find_feature(n).is_some_and(|x| x.suppressed)).collect();
+    if !suppressed.is_empty() {
+        let list = suppressed.iter().map(|n| format!("`{n}`")).collect::<Vec<_>>().join(", ");
+        *warning = Some(if suppressed.len() == features.len() {
+            format!("nothing to copy: {list} suppressed")
+        } else {
+            format!("{list} suppressed and not copied")
+        });
+    }
+    for name in features.iter().filter(|n| !suppressed.contains(n)) {
         // A sketch and its extrude often share a name; the feature that makes geometry wins.
         let src = doc
             .features
@@ -2515,7 +2533,7 @@ fn eval_feature(doc: &Document, vals: &BTreeMap<String, Value>, f: &Feature, st:
         FeatureKind::Pattern { features, pattern, bodies } => {
             let mats = pattern_transforms(vals, st, pattern)?;
             if bodies.is_empty() {
-                return replay(doc, vals, f, st, features, &mats);
+                return replay(doc, vals, f, st, features, &mats, warning);
             }
             // Bodies: each copy is a new body named after its source.
             for n in bodies {
@@ -2531,7 +2549,7 @@ fn eval_feature(doc: &Document, vals: &BTreeMap<String, Value>, f: &Feature, st:
         FeatureKind::Mirror { features, plane, bodies, combine } => {
             let pl = doc.resolve_plane_in(vals, plane, 0, Some(st))?;
             if bodies.is_empty() {
-                return replay(doc, vals, f, st, features, &[mirror_matrix(&pl)]);
+                return replay(doc, vals, f, st, features, &[mirror_matrix(&pl)], warning);
             }
             let m = mirror_matrix(&pl);
             for n in bodies {
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index ebe9aa8b..5c43f68f 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -434,6 +434,8 @@ mod delete_face_tests;
 #[cfg(test)]
 mod extent_tests;
 #[cfg(test)]
+mod pattern_suppress_tests;
+#[cfg(test)]
 mod profile_refs_tests;
 #[cfg(test)]
 mod split_face_tests;
diff --git a/crates/engine/src/pattern_suppress_tests.rs b/crates/engine/src/pattern_suppress_tests.rs
new file mode 100644
index 00000000..f52dd25f
--- /dev/null
+++ b/crates/engine/src/pattern_suppress_tests.rs
@@ -0,0 +1,35 @@
+//! A pattern of a suppressed feature has nothing to copy (#42): its copies go too, and the
+//! pattern says so.
+
+use serde_json::{Value, json};
+
+use crate::Session;
+
+fn run(s: &mut Session, id: &str, p: Value) -> Value {
+    match s.execute(id, &p) {
+        Ok(v) => v,
+        Err(e) => panic!("{id} {p}: {e}"),
+    }
+}
+
+fn volume(s: &Session, body: &str) -> f64 {
+    s.model.state().body(body).map(|b| solvecraft_kernel::measure(&b.body).unwrap().volume).unwrap_or(0.0)
+}
+
+#[test]
+fn suppressing_a_patterned_feature_removes_its_copies() {
+    let mut s = Session::default();
+    let script: Value = serde_json::from_str(include_str!("../../../examples/acceptance/sensor_enclosure.json")).unwrap();
+    s.run_script(&script).unwrap();
+    let full = volume(&s, "Case");
+    run(&mut s, "timeline.suppress", json!({"feature": "Standoff", "suppressed": true}));
+    let without = volume(&s, "Case");
+    // All four standoffs go (each 116.8 mm³), not just the seed.
+    assert!((full - without - 4.0 * 116.8).abs() < 2.0, "{full} → {without}");
+    let pattern = s.doc.find_feature("RectangularPattern1").unwrap().id;
+    let r = s.model.result(pattern).unwrap();
+    assert!(r.error.is_none() && r.warning.as_deref().is_some_and(|w| w.contains("Standoff")), "{r:?}");
+    // Back on: the four standoffs return.
+    run(&mut s, "timeline.suppress", json!({"feature": "Standoff", "suppressed": false}));
+    assert!((volume(&s, "Case") - full).abs() < 1e-6 * full);
+}
diff --git a/crates/ui-egui/tests/scenarios/acceptance_pattern_of_suppressed_feature.json b/crates/ui-egui/tests/scenarios/acceptance_pattern_of_suppressed_feature.json
index 898c0d0b..32a481f7 100644
--- a/crates/ui-egui/tests/scenarios/acceptance_pattern_of_suppressed_feature.json
+++ b/crates/ui-egui/tests/scenarios/acceptance_pattern_of_suppressed_feature.json
@@ -1,7 +1,4 @@
 [
- {
-  "pending": "#42: suppressing a patterned feature keeps the pattern's copies"
- },
  {
   "note": "Acceptance (#27): suppressing the PCB standoff takes the patterned copies with it."
  },