[fine] Some resilience, a design improvement for iterator

fine/tests/expression/alternates.fine

@@ -83,16 +83,20 @@ fun more_examples(weapon: MeleeWeapon or RangedWeapon) -> f64 or () {
 }
 
 // Some fun with iterators
+class Finished {}
+let FINISHED = new Finished {}
 
 class Iterator {
   current: f64;
 
-  fun next(self) -> f64 or () {
+  fun next(self) -> f64 or Finished {
     if self.current < 10 {
       let result = self.current;
       self.current = self.current + 1;
       return result;
     }
+
+    FINISHED
   }
 }
 

fine/tests/expression/errors/broken_conditional.fine

@@ -5,4 +5,3 @@ fun test() {
 // NOTE: These errors should be better
 // @expect-errors:
 // | 2:10: Error at 'true': expected a block after `if`
-// | 2:15: Error at '{': expect ';' to end an expression statement

fine/tests/expression/errors/wild_member_access.fine

@@ -11,8 +11,12 @@ fun test() {
 //       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 '{': expected an expression
-// | 7:13: Error at 'let': expect ';' to end a let statement
 // | 7:26: cannot find value foo here
 // | 8:0: Error at '}': unbalanced '}'