Lexer doesn't properly parse block comments that start in preprocessor directives

[douira]

The following code causes a parsing error:

#if fds /*
fdasfdsa fsa fds
*/

This has to be fixed in the lexer. It has worked in some cases but not always. There is also the issue with gradle somehow weirdly caching the generated parser and refusing to generate a new parser if the lexer changed without a change to the parser.