[Flex-help] Error changing yylex return.

[Fabricio S. P. <fab...@gm...>]

Hello,

I'm trying to change the default return value (int) from yylex to a 
structure. According to FLEX manual it's possible to change how yylex is 
declared[1]:

 >This definition may be changed by defining the YY_DECL macro. For 
 >example, you could use:
 >
 >         #define YY_DECL float lexscan( a, b ) float a, b;
 >

In my flex file I declared this way:

 >#define YY_DECL struct token yylex(yyscan_t yyscanner)

But after using this macro and compiling the final main program I got 
the following GCC error:

 >main.c: In function ‘main’:
 >main.c:14:7: error: incompatible types when assigning to type ‘struct 
 >token’ from type ‘int’
 >   lol = yylex(scanner);


Even after changing how yylex is declared the final result didn't 
change. After some search on the web I found this[2] stack overflow 
question, but I got the same error from GCC...

Anybody can help?

Here are some additional info:
OS:   Debian 8 64bit
GCC:  Debian 4.9.2-10 4.9.2
Flex: 2.5.39

And here are my source files:
https://gist.github.com/anonymous/49beeae0d85b4a7f91d6

Thanks in advance.

[1] 
http://flex.sourceforge.net/manual/Generated-Scanner.html#Generated-Scanner
[2] 
https://stackoverflow.com/questions/3796598/returning-non-ints-from-yylex
-- 
Fabrício S. Paranhos