SKIP: FAILED

<dawn>/src/tint/lang/msl/writer/printer/printer.cc:775 internal compiler error: main_out = struct @align(4) {
  x_2_1:u32 @offset(0), @location(0), @interpolate(flat)
  x_4_1:u32 @offset(4), @location(6), @interpolate(flat)
}

%b1 = block {  # root
  %x_1:ptr<private, u32, read_write> = var
  %x_2:ptr<private, u32, read_write> = var
  %x_3:ptr<private, u32, read_write> = var
  %x_4:ptr<private, u32, read_write> = var
}

%main_1 = func():void -> %b2 {
  %b2 = block {
    ret
  }
}
%tint_symbol = @fragment func(%x_1_param:u32 [@location(0), @interpolate(flat)], %x_3_param:u32 [@location(30), @interpolate(flat)]):main_out -> %b3 {
  %b3 = block {
    store %x_1, %x_1_param
    store %x_3, %x_3_param
    %9:void = call %main_1
    %10:u32 = load %x_2
    %11:u32 = load %x_4
    %12:main_out = construct %10, %11
    ret %12
  }
}

invalid entry point IO struct uses
********************************************************************
*  The tint shader compiler has encountered an unexpected error.   *
*                                                                  *
*  Please help us fix this issue by submitting a bug report at     *
*  crbug.com/tint with the source program that triggered the bug.  *
********************************************************************