#version 460
#extension GL_EXT_mesh_shader : enable

layout(local_size_x = 1) in;

// taskPayloadSharedEXT on a declaration that declares no variable
taskPayloadSharedEXT struct MyPayload {
    float x;
};
taskPayloadSharedEXT float;

MyPayload myPayloadData;

void main() {
    myPayloadData.x = 0.0;
    EmitMeshTasksEXT(1, 1, 1);
}