Error out of index_of if input is not a NumPy array.

QuLogic · QuLogic · commit 6b1950bad657 · 2020-05-19T19:10:40.000-04:00
diff --git a/lib/matplotlib/cbook/__init__.py b/lib/matplotlib/cbook/__init__.py
@@ -1606,8 +1606,15 @@ def index_of(y):
     try:
         return y.index.values, y.values
     except AttributeError:
+        pass
+    try:
         y = _check_1d(y)
+    except (np.VisibleDeprecationWarning, ValueError):
+        # NumPy 1.19 will warn on ragged input, and we can't actually use it.
+        pass
+    else:
         return np.arange(y.shape[0], dtype=float), y
+    raise ValueError('Input could not be cast to an at-least-1D NumPy array')
 
 
 def safe_first_element(obj):
