First iteration that should work correctly but seems to have some memory issues with entities

tests/lazy.rs

@@ -0,0 +1,51 @@
+#[test]
+fn cmp_lazy_nonlazy_events() {
+    let content = std::fs::read("testfiles/mirage.dem").unwrap();
+
+    let container = csdemo::Container::parse(&content).unwrap();
+    let demo = csdemo::parser::parse(
+        csdemo::FrameIterator::parse(container.inner),
+        csdemo::parser::EntityFilter::disabled(),
+    )
+    .unwrap();
+
+    let lazy_demo =
+        csdemo::lazyparser::LazyParser::new(csdemo::Container::parse(&content).unwrap());
+
+    for (normal, lazied) in demo
+        .events
+        .into_iter()
+        .zip(lazy_demo.events().filter_map(|e| e.ok()))
+    {
+        assert_eq!(normal, lazied);
+    }
+}
+
+#[test]
+fn cmp_lazy_nonlazy_entities() {
+    let content = std::fs::read("testfiles/mirage.dem").unwrap();
+
+    let container = csdemo::Container::parse(&content).unwrap();
+    let demo = csdemo::parser::parse(
+        csdemo::FrameIterator::parse(container.inner),
+        csdemo::parser::EntityFilter::all(),
+    )
+    .unwrap();
+
+    let lazy_demo =
+        csdemo::lazyparser::LazyParser::new(csdemo::Container::parse(&content).unwrap());
+
+    let mut normal_iter = demo
+        .entity_states
+        .ticks
+        .into_iter()
+        .flat_map(|t| t.states.into_iter().map(move |s| (t.tick, s)));
+    let mut lazy_iter = lazy_demo.entities().filter_map(|e| e.ok());
+
+    while let Some(normal) = normal_iter.next() {
+        let lazy = lazy_iter.next().unwrap();
+
+        assert_eq!(normal, lazy);
+    }
+    assert_eq!(None, lazy_iter.next());
+}