try fix filecheck

Signed-off-by: martinvuyk <[email protected]>

stdlib/src/collections/_index_normalization.mojo

@@ -98,6 +98,6 @@ fn normalize_index[
 
             @parameter
             if ignore_zero_length:
-                return idx if idx > -1 else (idx + c_len if c_len != 0 else 0)
-            else:
-                return idx if idx > -1 else idx + c_len
+                if c_len == 0:
+                    return 0
+            return idx if idx > -1 else idx + c_len

stdlib/test/collections/test_index_normalization.mojo

@@ -10,7 +10,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ===----------------------------------------------------------------------=== #
-# RUN: %bare-mojo -D ASSERT=warn %s
+# RUN: %bare-mojo -D ASSERT=warn %s | FileCheck %s
 
 from collections._index_normalization import normalize_index
 
@@ -48,9 +48,30 @@ def _test[branchless: Bool]():
     assert_equal(clamp(2, container), 2)
     assert_equal(clamp(3, container), 3)
 
+    # test clamp to container length overflow
+    # CHECK: TestContainer has length: 4. Index out of bounds: -8 should be between -4 and 3
+    assert_equal(clamp(-8, container), 0)
+    # CHECK: TestContainer has length: 4. Index out of bounds: -7 should be between -4 and 3
+    assert_equal(clamp(-7, container), 0)
+    # CHECK: TestContainer has length: 4. Index out of bounds: -6 should be between -4 and 3
+    assert_equal(clamp(-6, container), 0)
+    # CHECK: TestContainer has length: 4. Index out of bounds: -5 should be between -4 and 3
+    assert_equal(clamp(-5, container), 0)
+    # CHECK: TestContainer has length: 4. Index out of bounds: 4 should be between -4 and 3
+    assert_equal(clamp(4, container), 3)
+    # CHECK: TestContainer has length: 4. Index out of bounds: 5 should be between -4 and 3
+    assert_equal(clamp(5, container), 3)
+    # CHECK: TestContainer has length: 4. Index out of bounds: 6 should be between -4 and 3
+    assert_equal(clamp(6, container), 3)
+    # CHECK: TestContainer has length: 4. Index out of bounds: 7 should be between -4 and 3
+    assert_equal(clamp(7, container), 3)
 
     # test container with zero length
     container = List[Int]()
+    # CHECK: Indexing into a TestContainer that has 0 elements
+    _ = clamp(-8, container)
+    # CHECK: Indexing into a TestContainer that has 0 elements
+    _ = no_clamp(-8, container)
     alias ign_zero_clamp = normalize_index[
         t,
         ignore_zero_length=True,