               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %main "main" %sk_FragColor
               OpExecutionMode %main OriginUpperLeft
               OpName %testBlock "testBlock"
               OpMemberName %testBlock 0 "x"
               OpName %sk_FragColor "sk_FragColor"
               OpName %main "main"
               OpMemberDecorate %testBlock 0 Offset 0
               OpDecorate %testBlock BufferBlock
               OpDecorate %3 Binding 456
               OpDecorate %3 DescriptorSet 0
               OpDecorate %sk_FragColor RelaxedPrecision
               OpDecorate %sk_FragColor Location 0
               OpDecorate %sk_FragColor Index 0
               OpDecorate %18 RelaxedPrecision
      %float = OpTypeFloat 32
  %testBlock = OpTypeStruct %float
%_ptr_Uniform_testBlock = OpTypePointer Uniform %testBlock
          %3 = OpVariable %_ptr_Uniform_testBlock Uniform
    %v4float = OpTypeVector %float 4
%_ptr_Output_v4float = OpTypePointer Output %v4float
%sk_FragColor = OpVariable %_ptr_Output_v4float Output
       %void = OpTypeVoid
         %11 = OpTypeFunction %void
        %int = OpTypeInt 32 1
      %int_0 = OpConstant %int 0
%_ptr_Uniform_float = OpTypePointer Uniform %float
       %main = OpFunction %void None %11
         %12 = OpLabel
         %15 = OpAccessChain %_ptr_Uniform_float %3 %int_0
         %17 = OpLoad %float %15
         %18 = OpCompositeConstruct %v4float %17 %17 %17 %17
               OpStore %sk_FragColor %18
               OpReturn
               OpFunctionEnd