Change [make opam] to just use [opam publish].

which produces a token [SEMI]. The parser SEMI to appear in three places:
after a declaration; after a rule; after a producer. Only two grammars in
the test suite have required changes.

It is replaced with [Positions.import] in a singleton list.

when bound to a wildcard pattern. Thus, avoid triggering OCaml's warning 9.

These change because "minimal" information is now printed at -la 2.

This one changes because the standard library has grown.