Fix formatting in priority_queue.mbt and vec.mbt

priority_queue/priority_queue.mbt

@@ -267,7 +267,7 @@ test "clear" {
 /// let is_empty = queue.is_empty() // true
 /// ```
 pub fn is_empty[T](self : PriorityQueue[T]) -> Bool {
-  self.len == 0    
+  self.len == 0
 }
 
 test "is_empty" {

priority_queue/types.mbt

@@ -23,4 +23,4 @@ struct PriorityQueue[T] {
   min : Bool
   mut len : Int
   mut top : Node[T]
-}
+}

vec/vec.mbt

@@ -35,13 +35,12 @@ pub fn to_string[T : Show](self : Vec[T]) -> String {
     return "Vec::[]"
   }
   let first = self.buf[0]
-  for i = 1, init = "Vec::[\(first)"; ; {
-    if i < self.len {
-      let cur = self.buf[i]
-      continue i + 1, "\(init),\(cur)"
-    } else {
+  for i = 1, init = "Vec::[\(first)" {
+    if i >= self.len {
       break "\(init)]"
     }
+    let cur = self.buf[i]
+    continue i + 1, "\(init),\(cur)"
   }
 }