playground-qml example does not work

$ ./playground-qml 
Could not read shader source file: ":/shaders/diffuse.vert"
Could not read shader source file: ":/shaders/diffuse.frag"
Problem creating accessible interface for:  Window(0x7fff4fc428f8) 
Make sure to deploy Qt with accessibility plugins.
QOpenGLShader::compile(Fragment): ERROR: 0:35: ';' : syntax error: Uniform blocks may not have identifiers in GLSL 140

*** Problematic Fragment shader source code ***

                            #version 140
#define lowp
#define mediump
#define highp
#line 3
                            in vec3 worldPosition;
                            in vec3 normal;
                            in vec2 texCoord;
                            out vec4 fragColor;

                            struct subStruct
                            {
                                float a;
                                float b;
                                float r[4];
                            };

                            struct innerStruct
                            {
                                float innerV;
                                vec3  innerVec3;
                                vec3  innerVec3Array[4];
                                subStruct t;
                                subStruct c[2];
                            };

                            uniform PointLightBlock
                            {
                                vec4 colorAmbient;
                                vec4 colorDiffuse;
                                vec4 colorSpecular;
                                float shininess;
                                vec3 position;
                                vec3 intensity;
                                innerStruct s;
                                innerStruct u[4];
                            } lightSource;

                            uniform sampler2D tex;

[...cut for brevity...]

***
Failed to compile shader: "ERROR: 0:35: ';' : syntax error: Uniform blocks may not have identifiers in GLSL 140\n"
Qt3D.Renderer.Rendering: GL error after drawing mesh: "502"
Qt3D.Renderer.Rendering: GL error after drawing mesh: "502"
Qt3D.Renderer.Rendering: GL error after drawing mesh: "502"
Qt3D.Renderer.Rendering: GL error after drawing mesh: "502"
Qt3D.Renderer.Rendering: GL error after drawing mesh: "502"
Qt3D.Renderer.Rendering: GL error after drawing mesh: "502"
Qt3D.Renderer.Rendering: GL error after drawing mesh: "502"
Qt3D.Renderer.Rendering: GL error after drawing mesh: "502"
...