Capability System: __target_switch never compares case: capabilities to the parent [require(...)]

[ArielG-NV]

Problem:
following code will compile but should at a minimum warn:

[require(glsl_hlsl)]
void myfunc()
{
    __target_switch
    {
    case hlsl:
    case spirv:
    }
}

Expected behavior:
error since spirv is not listed by the parent [require(...)]