Only check against sequential if we interleaved

ConflictSet.cpp

@@ -4351,17 +4351,17 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
       // Kick off the sequence of tail calls that finally returns once all jobs
       // are done
       inProgress->continuation(inProgress, &context);
-    }
 
 #ifndef NDEBUG
-    Arena arena;
-    auto *results2 = new (arena) Result[count];
-    CheckContext context2;
-    context2.readContext.impl = this;
-    useSequential(reads, results2, count, context2);
-    assert(memcmp(result, results2, count) == 0);
-    assert(context.readContext == context2.readContext);
+      Arena arena;
+      auto *results2 = new (arena) Result[count];
+      CheckContext context2;
+      context2.readContext.impl = this;
+      useSequential(reads, results2, count, context2);
+      assert(memcmp(result, results2, count) == 0);
+      assert(context.readContext == context2.readContext);
 #endif
+    }
 
 #else
     useSequential(reads, result, count, context);