[fine] Support assignment to member, loops with iterators

Hmm it's starting to look like something.

fine/tests/expression/errors/wild_member_access.fine

@@ -7,15 +7,6 @@ fun test() {
   let z = f.{let y = 222; foo };
 }
 
-// NOTE: The AST allows for generic expressions to the right of the dot.
-//       We need to make sure things are parsed correctly.
-//
-// TODO: Better parser recovery will improve the specifics of the errors.
-//
-// TODO: This is parsed wrong; the `{` is consumed after the '.' and it
-// should instead be ignored. This is the "greedy" expression parsing that
-// matklad talks about in his resilient parser article.
-//
 // @expect-errors:
-// | 7:12: Error at '{': expect ';' to end a let statement
+// | 7:12: Error at '{': expected an identifier after a '.' in member access
 // | 7:26: cannot find value foo here