Custom HLSL with 'int' parameter, without the 'in/out/inout' access modifier is not supported

Steps to reproduce:
1. Create a new VFX Graph
2. Add a Custom HLSL block
3. Open the HLSL code editor by clicking on the edit button
4. Copy / paste the function below:

void CustomHLSL(inout VFXAttributes attributes, int e)
{
  //Nothing
}

Actual results: 
The VFX does not compile (the int type is misinterpreted as in access modifier)

Expected results: 
The VFX compiles fine

Reproducible with versions: 
6000.01f1

Not reproducible with versions: 
Can’t test with versions: 
2022.x and 2021.x, the feature did not exist

Tested on (OS): 
Windows, but should not be OS dependent.

Notes:
At least, there's an error feedback in that case, but the message is not really accurate.