TODO item.

TODO

 * Ongoing work on positions.
-  Remove the function [positions] in the incremental API? or update its doc.
+  - remove the function [positions] in the incremental API? or update its doc.
   - on peut offrir un $symbolstartpos(i) qui calcule de la même
     manière que Parsing.symbol_start_pos.
+  - tester que $startpos(i) est conforme à rhs_start_pos(i),
+    idem pour end
 
 * Develop an alternate src/Makefile that does not require ocamlbuild?
   Could use OCamlMakefile instead, for instance.