Issue Description

I had a variable definition on global scope with a semantic qualifier:

static int2 group_thread_id: SV_GroupThreadID

This compiles without error, but the variable does not hold the correct value. This was a very hard to find bug.

Reproducer Code

See above.

Expected Behavior

The variable should either contain the correct value or error when compiling.

Actual Behavior

The shader compiled without error but the variable did not contain the correct value

Environment

• Slang Version 2025.14.3
• OS Arch Linux 6.16.4
• GPU/Driver version AMD / Mesa 1:25.2.2-2 / vulkan-radeon 1:25.2.2-2

Additional context