SKIP: FAILED

; SPIR-V
; Version: 1.3
; Generator: Google Tint Compiler; 0
; Bound: 43
; Schema: 0
               OpCapability Shader
               OpMemoryModel Logical GLSL450
               OpEntryPoint Vertex %vertex_main "vertex_main" %tint_pointsize
               OpEntryPoint Fragment %fragment_main "fragment_main"
               OpEntryPoint GLCompute %compute_main "compute_main"
               OpExecutionMode %fragment_main OriginUpperLeft
               OpExecutionMode %compute_main LocalSize 1 1 1
               OpName %tint_pointsize "tint_pointsize"
               OpName %arg_0 "arg_0"
               OpName %arg_1 "arg_1"
               OpName %textureSampleGrad_872f00 "textureSampleGrad_872f00"
               OpName %res "res"
               OpName %vertex_main "vertex_main"
               OpName %fragment_main "fragment_main"
               OpName %compute_main "compute_main"
               OpDecorate %tint_pointsize BuiltIn PointSize
               OpDecorate %arg_0 DescriptorSet 1
               OpDecorate %arg_0 Binding 0
               OpDecorate %arg_1 DescriptorSet 1
               OpDecorate %arg_1 Binding 1
      %float = OpTypeFloat 32
%_ptr_Output_float = OpTypePointer Output %float
          %4 = OpConstantNull %float
%tint_pointsize = OpVariable %_ptr_Output_float Output %4
          %7 = OpTypeImage %float 2D 0 1 0 1 Unknown
%_ptr_UniformConstant_7 = OpTypePointer UniformConstant %7
      %arg_0 = OpVariable %_ptr_UniformConstant_7 UniformConstant
         %10 = OpTypeSampler
%_ptr_UniformConstant_10 = OpTypePointer UniformConstant %10
      %arg_1 = OpVariable %_ptr_UniformConstant_10 UniformConstant
       %void = OpTypeVoid
         %11 = OpTypeFunction %void
    %v4float = OpTypeVector %float 4
         %19 = OpTypeSampledImage %7
    %v3float = OpTypeVector %float 3
        %int = OpTypeInt 32 1
      %int_1 = OpConstant %int 1
    %v2float = OpTypeVector %float 2
         %27 = OpConstantNull %v2float
      %v2int = OpTypeVector %int 2
         %29 = OpConstantNull %v2int
%_ptr_Function_v4float = OpTypePointer Function %v4float
         %32 = OpConstantNull %v4float
    %float_1 = OpConstant %float 1
%textureSampleGrad_872f00 = OpFunction %void None %11
         %14 = OpLabel
        %res = OpVariable %_ptr_Function_v4float Function %32
         %17 = OpLoad %10 %arg_1
         %18 = OpLoad %7 %arg_0
         %20 = OpSampledImage %19 %18 %17
         %22 = OpConvertSToF %float %int_1
         %25 = OpCompositeConstruct %v3float %22
         %15 = OpImageSampleExplicitLod %v4float %20 %25 Grad|ConstOffset %27 %27 %29
               OpStore %res %15
               OpReturn
               OpFunctionEnd
%vertex_main = OpFunction %void None %11
         %34 = OpLabel
               OpStore %tint_pointsize %float_1
         %36 = OpFunctionCall %void %textureSampleGrad_872f00
               OpReturn
               OpFunctionEnd
%fragment_main = OpFunction %void None %11
         %38 = OpLabel
         %39 = OpFunctionCall %void %textureSampleGrad_872f00
               OpReturn
               OpFunctionEnd
%compute_main = OpFunction %void None %11
         %41 = OpLabel
         %42 = OpFunctionCall %void %textureSampleGrad_872f00
               OpReturn
               OpFunctionEnd


Validation Failure:
1:1: Expected number of constituents to be at least 2
  %25 = OpCompositeConstruct %v3float %22