case 'e':
			ret = &BuiltinType{Name: "decimal128"}
		case 'h':
			ret = &BuiltinType{Name: "half"}
		case 'u':
			ret = &BuiltinType{Name: "char8_t"}
		case 's':
			ret = &BuiltinType{Name: "char16_t"}
		case 'i':
			ret = &BuiltinType{Name: "char32_t"}
		case 'n':
			ret = &BuiltinType{Name: "decltype(nullptr)"}

		case 'F':
			accum := false
			bits := 0