Fix composed completion undo

src/realm.js

@@ -863,11 +863,17 @@ export class Realm {
           this.restoreBindings(result.modifiedBindings);
           this.restoreProperties(result.modifiedProperties);
         } else {
-          if (this.savedCompletion !== undefined) {
-            this.stopEffectCaptureAndUndoEffects(this.savedCompletion);
-          }
           this.restoreBindings(this.modifiedBindings);
           this.restoreProperties(this.modifiedProperties);
+          let completion = this.savedCompletion;
+          while (completion !== undefined) {
+            const { savedEffects } = completion;
+            if (savedEffects !== undefined) {
+              this.restoreBindings(savedEffects.modifiedBindings);
+              this.restoreProperties(savedEffects.modifiedProperties);
+            }
+            completion = completion.composedWith;
+          }
         }
         this.generator = saved_generator;
         this.modifiedBindings = savedBindings;

test/serializer/pure-functions/FatalErrorAfterJoins.js

@@ -0,0 +1,29 @@
+if (!global.__evaluatePureFunction) global.__evaluatePureFunction = f => f();
+
+const result = global.__evaluatePureFunction(() => {
+  let x, y, z;
+
+  function f() {
+    const getNumber = global.__abstract ? global.__abstract("function", "(() => 1)") : () => 1;
+    const b1 = global.__abstract ? global.__abstract("boolean", "true") : true;
+    const b2 = global.__abstract ? global.__abstract("boolean", "!false") : true;
+    const b3 = global.__abstract ? global.__abstract("boolean", "!!true") : true;
+
+    x = getNumber();
+    if (!b1) throw new Error("abrupt");
+    y = getNumber();
+    if (!b2) throw new Error("abrupt");
+    z = getNumber();
+    if (!b3) throw new Error("abrupt");
+
+    if (global.__fatal) global.__fatal();
+
+    return x + y + z;
+  }
+
+  f();
+
+  return x + y + z;
+});
+
+global.inspect = () => result;