Function set_zero

sources/compiler/lexer.cpp:31–34

namespace codecvt_gbk {
	static inline char32_t set_zero(char32_t ch)
	{
		return ch & 0x0000ffff;
	}

	static constexpr std::uint8_t u8_blck_begin = 0x80;
	static constexpr std::uint32_t u32_blck_begin = 0x8000;