Have a more explicit error when trying to use a struct member output interpolator as an input

Hello
This is a suggestion because I founded that the error given by the compiler was not really explicit when trying a compile a mesh shader.
I made a very minimal repro here, try to compile this file:

// compile with :
// dxc.exe main.hlsl /Zi /E"main" /Od /Fo test.mso /Tms_6_6 -Qembed_debug

struct Vertex {
	float4 m_sv_position : SV_POSITION;
	float m_value : VALUE;
};

[numthreads(128, 1, 1)]
[OutputTopology("triangle")]
void main( out vertices Vertex _vertices[ 64 ] 
	, out indices uint3 _triangles[ 126 ]
	, in uint3 _sv_groupthreadid : SV_GROUPTHREADID )
{
	const float toto = -1.0;

	SetMeshOutputCounts( 64, 126 );

	if ( _sv_groupthreadid.x < 64 ) {
		_vertices[ _sv_groupthreadid.x ].m_sv_position = float4( 0.0, 0.0, 0.0, 0.0 );
		_vertices[ _sv_groupthreadid.x ].m_value = 0;
		_vertices[ _sv_groupthreadid.x ].m_value *= sign( toto );
	}


	if ( _sv_groupthreadid.x < 126 )
	{
		_triangles[ _sv_groupthreadid.x ] = uint3( 1, 2, 3 );
	}
}

With

dxc.exe main.hlsl /Zi /E"main" /Od /Fo test.mso /Tms_6_6 -Qembed_debug

You will get the following error:

main.hlsl:11: error: Function main with parameter is not permitted, it should be inlined. Validation failed.

Which is not very explicit, in a huge shader I would really appreciate to have something like:

main.hlsl:22: error: you use semantic output member m_value as an input which is forbbiden

The same kind of error happen when you use for instance _vertices[ _sv_groupthreadid.x ].m_value as a function parameter even if the parameter of the function is marked as out

Reproduce the issue with main.hlsl using the provided dxc.exe mesh-shader command, then trace the validation failure reported as “Function main with parameter is not permitted.” Done means the compiler emits a diagnostic identifying the struct member output interpolator used as an input, including the relevant member or source location, with coverage for the shown repro and function-parameter case.