Move /src/test to /tests

tests/ui/for-loop-while/while-let.rs

@@ -0,0 +1,46 @@
+// run-pass
+
+use std::collections::BinaryHeap;
+
+fn make_pq() -> BinaryHeap<isize> {
+    BinaryHeap::from(vec![1,2,3])
+}
+
+pub fn main() {
+    let mut pq = make_pq();
+    let mut sum = 0;
+    while let Some(x) = pq.pop() {
+        sum += x;
+    }
+    assert_eq!(sum, 6);
+
+    pq = make_pq();
+    sum = 0;
+    'a: while let Some(x) = pq.pop() {
+        sum += x;
+        if x == 2 {
+            break 'a;
+        }
+    }
+    assert_eq!(sum, 5);
+
+    pq = make_pq();
+    sum = 0;
+    'a2: while let Some(x) = pq.pop() {
+        if x == 3 {
+            continue 'a2;
+        }
+        sum += x;
+    }
+    assert_eq!(sum, 3);
+
+    let mut pq1 = make_pq();
+    sum = 0;
+    while let Some(x) = pq1.pop() {
+        let mut pq2 = make_pq();
+        while let Some(y) = pq2.pop() {
+            sum += x * y;
+        }
+    }
+    assert_eq!(sum, 6 + 12 + 18);
+}