bug/tint/1369.wgsl:3:3 warning: code is unreachable
  return true;
  ^^^^^^

bug/tint/1369.wgsl:9:9 warning: code is unreachable
    var also_unreachable : bool;
        ^^^^^^^^^^^^^^^^

; SPIR-V
; Version: 1.3
; Generator: Google Tint Compiler; 0
; Bound: 23
; Schema: 0
               OpCapability Shader
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %f "f"
               OpExecutionMode %f OriginUpperLeft
               OpName %tint_discard "tint_discard"
               OpName %call_discard "call_discard"
               OpName %tint_discard_func "tint_discard_func"
               OpName %f "f"
               OpName %v "v"
       %bool = OpTypeBool
      %false = OpConstantFalse %bool
%_ptr_Private_bool = OpTypePointer Private %bool
%tint_discard = OpVariable %_ptr_Private_bool Private %false
          %5 = OpTypeFunction %bool
       %true = OpConstantTrue %bool
          %9 = OpConstantNull %bool
       %void = OpTypeVoid
         %10 = OpTypeFunction %void
%_ptr_Function_bool = OpTypePointer Function %bool
%call_discard = OpFunction %bool None %5
          %7 = OpLabel
               OpStore %tint_discard %true
               OpReturnValue %9
               OpFunctionEnd
%tint_discard_func = OpFunction %void None %10
         %13 = OpLabel
               OpKill
               OpFunctionEnd
          %f = OpFunction %void None %10
         %15 = OpLabel
          %v = OpVariable %_ptr_Function_bool Function %9
         %16 = OpFunctionCall %bool %call_discard
               OpStore %v %16
         %19 = OpLoad %bool %tint_discard
               OpSelectionMerge %20 None
               OpBranchConditional %19 %21 %20
         %21 = OpLabel
         %22 = OpFunctionCall %void %tint_discard_func
               OpReturn
         %20 = OpLabel
               OpReturn
               OpFunctionEnd