Make parser create trees

scanner.l

@@ -7,6 +7,7 @@
 #include <stack>
 #include <cstdlib>
 
+#include "tree.hpp"
 #include "parser.hpp"
 
 /*
@@ -44,8 +45,7 @@ std::stack<int> _indent_stack;
   YYLTYPE loc;
 
   #define PUSH_TOKEN(token, text) do {                         \
-    yylval = text ? new std::string(text) : NULL;              \
-    loc.first_line = loc.last_line = yylineno;                 \
+    yylval.str = text ? new std::string(text) : NULL;              \
     int status = yypush_parse(pstate, token, &yylval, &loc);   \
     if (status != YYPUSH_MORE) {                               \
       yypstate_delete(pstate);                                 \