C++11 enums don’t work as integer constants as expected

Is your feature request related to a problem? Please describe.

Thanks to HLSL2021 I can share enumeration declarations between C++ and HLSL202x.

Bug Report: However whenever I declare the enum class HLSL does not complain until I actually try to use the scoped enum. Seems that enum class passes through your tokenizer unharmed, but then the rest of the logic is gone.

Describe the solution you'd like

For the compiler to support scope enum lookup enum_t:: without errors.

Describe alternatives you've considered

Not using scoped enums but a lot of my C++ code I want to expose to HLSL already does, so not fun.

Additional context

Here's a repro:
https://godbolt.org/z/1TdYh9E1a

Start by reproducing the scoped-enum lookup failure with the linked Godbolt example and trace how the DirectX Shader Compiler parses and resolves enum class references. Confirm that enum_t:: uses compile without errors while preserving the shared C++/HLSL declarations; the payload does not name a source file or test to run.