fix Simulator panicking when you use PhantomConst

crates/fayalite/tests/sim.rs

@@ -2244,3 +2244,41 @@ fn test_sim_resettable_counter_async_immediate_reset() {
         panic!();
     }
 }
+
+#[hdl_module(outline_generated)]
+pub fn phantom_const() {
+    #[hdl]
+    let out: Array<PhantomConst<Vec<String>>, 2> =
+        m.output(Array::new_static(PhantomConst::new_sized(vec![
+            "a".into(),
+            "b".into(),
+        ])));
+    let _ = out;
+    #[hdl]
+    let mut mem = memory(PhantomConst::new("mem_element"));
+    mem.depth(1);
+    let port = mem.new_read_port();
+    connect_any(port.addr, 0u8);
+    connect(port.clk, false.to_clock());
+    connect(port.en, false);
+}
+
+#[test]
+fn test_phantom_const() {
+    let _n = SourceLocation::normalize_files_for_tests();
+    let mut sim = Simulation::new(phantom_const());
+    let mut writer = RcWriter::default();
+    sim.add_trace_writer(VcdWriterDecls::new(writer.clone()));
+    sim.advance_time(SimDuration::from_micros(1));
+    sim.flush_traces().unwrap();
+    let vcd = String::from_utf8(writer.take()).unwrap();
+    println!("####### VCD:\n{vcd}\n#######");
+    if vcd != include_str!("sim/expected/phantom_const.vcd") {
+        panic!();
+    }
+    let sim_debug = format!("{sim:#?}");
+    println!("#######\n{sim_debug}\n#######");
+    if sim_debug != include_str!("sim/expected/phantom_const.txt") {
+        panic!();
+    }
+}