For the comment ended by \r\n in windows:

//This is a line comment\r\n      

in Linux, ended by \n

//This is a line comment\n      

The parser capture:
In linux: This is a line comment
In Windows: This is a line comment\r

That is because the line:

from rest in Parse.CharExcept(NewLine).Many().Text()    //NewLine= "\n"

It's best to handle NeLine in CommentParser class for Linux/Windows Environment at Runtime.