[fine] More resilience

We don't lose function declarations and whatnot, although we get lost
with broken return types.

fine/tests/expression/alternates.fine

@@ -8,10 +8,9 @@ class Bar {
 }
 
 fun extract_value(v: Foo or Bar) -> f64 {
-  if v is Foo {
-    v.x // Magic type binding!
-  } else if v is Bar {
-    v.y // Same magic re-binding of the variable to the new type
+  match v {
+    v:Foo -> v.x,
+    v:Bar -> v.y,
   } // No error; exhaustivity analysis should work.
 }
 
@@ -34,10 +33,9 @@ class Monster {
 fun print(x:string) {}
 
 fun in_range(weapon: MeleeWeapon or RangedWeapon, distance: f64) {
-  if weapon is w : RangedWeapon {
-    distance >= w.minRange and distance <= w.maxRange
-  } else {
-    distance == 1
+  weapon match {
+    w:RangedWeapon -> distance >= w.minRange and distance <= w.maxRange,
+    _ -> distance == 1
   }
 }
 
@@ -60,12 +58,9 @@ fun attack(weapon: MeleeWeapon or RangedWeapon, monster: Monster, distance: f64)
   //       local variables. The *almost* part is that the effective type of the
   //       variable changes but not the binding. (Is this what we want?)
   //
-  // TODO: What do we do about captured variables?
-  //
-  let damage = if weapon is w: MeleeWeapon {
-    roll_dice(w.damage)
-  } else if weapon is w: RangedWeapon {
-    w.maxRange - w.minRange
+  let damage = match weapon {
+    w:MeleeWeapon -> roll_dice(w.damage),
+    w:RangedWeapon -> w.maxRange - w.minRange,
   };
 
   if monster.health <= damage {
@@ -87,7 +82,7 @@ fun more_examples(weapon: MeleeWeapon or RangedWeapon) -> f64 or () {
 
 // Some fun with iterators
 class Finished {}
-let FINISHED = new Finished {}
+let FINISHED = new Finished {};
 
 class Iterator {
   current: f64;
@@ -132,5 +127,5 @@ fun test() -> f64 {
   // like the above.
 }
 
-// @ignore WIP
+/// @ignore WIP
 // @no-errors

fine/tests/expression/errors/wild_member_access.fine

@@ -17,6 +17,5 @@ fun test() {
 // matklad talks about in his resilient parser article.
 //
 // @expect-errors:
-// | 7:12: Error at '{': expected an expression
+// | 7:12: Error at '{': expect ';' to end a let statement
 // | 7:26: cannot find value foo here
-// | 8:0: Error at '}': unbalanced '}'