test: Move two tests from run-pass into the libs

src/libcore/at_vec.rs

@@ -198,3 +198,19 @@ mod unsafe {
     }
 
 }
+
+#[test]
+fn test() {
+    // Some code that could use that, then:
+    fn seq_range(lo: uint, hi: uint) -> @[uint] {
+        do build |push| {
+            for uint::range(lo, hi) |i| {
+                push(i);
+            }
+        }
+    }
+
+    assert seq_range(10, 15) == @[10, 11, 12, 13, 14];
+    assert from_fn(5, |x| x+1) == @[1, 2, 3, 4, 5];
+    assert from_elem(5, 3.14) == @[3.14, 3.14, 3.14, 3.14, 3.14];
+}

src/libcore/ptr.rs

@@ -200,3 +200,14 @@ fn test_buf_len() {
         }
     }
 }
+
+#[test]
+fn test_is_null() {
+   let p: *int = ptr::null();
+   assert p.is_null();
+   assert !p.is_not_null();
+
+   let q = ptr::offset(p, 1u);
+   assert !q.is_null();
+   assert q.is_not_null();
+}