HLSL - cannot work with structured buffers of member variables

The following HLSL code does not compile with glslang:

---8<---
struct TestB
{
int test;
};

struct TestA
{
StructuredBuffer TestB;
};

struct SkyLightingParams
{
TestA testA;
StructuredBuffer GetTestB() { return testA.TestB; }
};

float4 ShadeVertex(in uint vertexIndex : VERTEXID) : VS_OUT_POSITION
{
return float4(0,0,0,0);
}

---8<---

The error returned is:

'this' : cannot access member variables (static member function?)

Start by reproducing the HLSL snippet with glslang and confirm the reported member-variable diagnostic. Trace the HLSL handling for StructuredBuffer members and member functions; done means the example compiles correctly and a regression test covers this case.

Written by the indexing model from the issue text.