#version 450
layout(local_size_x = 1) in;

struct Foo
{
	vec3 a; // <- This one should become packed_float3, and the MSL alignment of the struct is now 4.
	float b;
};

layout(std140, set = 0, binding = 0) buffer SSBO
{
	vec2 a;
	float b;
	// <- We expect 4 bytes of padding here since MSL alignment of Foo must be lowered to 4.
	Foo foo;
};

void main()
{
	a.x = 10.0;
	b = 20.0;
}