I can see that _wat2wasm_ does have the option to enable "gc", but when running the example below (with all features enabled), it fail. The example is from the article: https://v8.dev/blog/wasm-gc-porting

```wat
(module
  (type $Node (struct (field $next (ref null $Node)) (field $value (mut i32))))

  (global $global (mut (ref null $Node)) (ref.null $Node))

  (export "global" (global $global))

  (export "_start" (func $_start))

  (func $_start
    (local $i i32)
    (loop $loop
      (global.set $global
        (struct.new $Node
          (global.get $global)
          (local.get $i)
        )
      )
      (local.set $i
        (i32.add
          (local.get $i)
          (i32.const 1)
        )
      )
    
      (br_if $loop
        (i32.le_u
          (local.get $i)
          (i32.const 1000)
        )
      )
    )

  )
)
```

The error:

```
Error: parseWat failed:
test.wast:2:41: error: unexpected token "null", expected a numeric index or a name (e.g. 12 or $foo).
  (type $Node (struct (field $next (ref null $Node)) (field $value (mut i32))))
```
  
Is there any roadmap for the GC spec in _wat2wasm_? 
Unexpected token "null" with WasmGC example
This is a GitHub Issue
repo:wabt
owner:WebAssembly
Title : Unexpected token "null" with WasmGC example
Issue date:

--- start body ---
I can see that _wat2wasm_ does have the option to enable "gc", but when running the example below (with all features enabled), it fail. The example is from the article: https://v8.dev/blog/wasm-gc-porting

```wat
(module
  (type $Node (struct (field $next (ref null $Node)) (field $value (mut i32))))

  (global $global (mut (ref null $Node)) (ref.null $Node))

  (export "global" (global $global))

  (export "_start" (func $_start))

  (func $_start
    (local $i i32)
    (loop $loop
      (global.set $global
        (struct.new $Node
          (global.get $global)
          (local.get $i)
        )
      )
      (local.set $i
        (i32.add
          (local.get $i)
          (i32.const 1)
        )
      )
    
      (br_if $loop
        (i32.le_u
          (local.get $i)
          (i32.const 1000)
        )
      )
    )

  )
)
```

The error:

```
Error: parseWat failed:
test.wast:2:41: error: unexpected token "null", expected a numeric index or a name (e.g. 12 or $foo).
  (type $Node (struct (field $next (ref null $Node)) (field $value (mut i32))))
```
  
Is there any roadmap for the GC spec in _wat2wasm_? 
--- end body ---
