[PATCH 09/14] c++: Implement __is_unsigned built-in trait

[Jason Merrill]

On 1/10/24 04:23, Ken Matsui wrote:
> This patch implements built-in trait for std::is_unsigned.
> 
> +    case CPTK_IS_UNSIGNED:
> +      return TYPE_UNSIGNED (type1);

This seems to lack the checks for arithmetic type that the __is_signed 
patch has.

Jason