719     bool isValidCodeUnit(E c) @safe pure @nogc nothrow  in GenericEncoder()
812     bool isValidCodeUnit(AsciiChar c) @safe pure nothrow @nogc  in isValidCodeUnit()  function
895     bool isValidCodeUnit(Latin1Char c) @safe pure nothrow @nogc  in isValidCodeUnit()  function
1185     bool isValidCodeUnit(char c) @safe pure nothrow @nogc  in isValidCodeUnit()  function
1351     bool isValidCodeUnit(wchar c) @safe pure nothrow @nogc  in isValidCodeUnit()  function
1448     bool isValidCodeUnit(dchar c) @safe pure @nogc nothrow  in isValidCodeUnit()  function
1603 bool isValidCodeUnit(E)(E c)  in isValidCodeUnit()  function
1605     return EncoderInstance!(E).isValidCodeUnit(c);  in isValidCodeUnit()
1611     assert(!isValidCodeUnit(cast(char) 0xC0));
1612     assert(!isValidCodeUnit(cast(char) 0xFF));
1613     assert( isValidCodeUnit(cast(wchar) 0xD800));
1614     assert(!isValidCodeUnit(cast(dchar) 0xD800));
1615     assert(!isValidCodeUnit(cast(AsciiChar) 0xA0));
1616     assert( isValidCodeUnit(cast(Windows1250Char) 0x80));
1617     assert(!isValidCodeUnit(cast(Windows1250Char) 0x81));
1618     assert( isValidCodeUnit(cast(Windows1252Char) 0x80));
1619     assert(!isValidCodeUnit(cast(Windows1252Char) 0x81));