pub fn check_arg_count<'a, 'tcx, const N: usize>( args: &'a [OpTy<'tcx>], ) -> InterpResult<'tcx, &'a [OpTy<'tcx>; N]>where &'a [OpTy<'tcx>; N]: TryFrom<&'a [OpTy<'tcx>]>,
Check that the number of args is what we expect.