diff --git a/findiff/legacy/operators.py b/findiff/legacy/operators.py
index 7aba623..061ba01 100644
--- a/findiff/legacy/operators.py
+++ b/findiff/legacy/operators.py
@@ -119,34 +119,16 @@ def _eval_args(self, args, kwargs):
         if "acc" in kwargs:
             self.acc = kwargs["acc"]
 
-        if isinstance(args[0], tuple):  # mixed partial derivative
-            pds = None
-
-            for arg in args:
-                if len(arg) == 3:
-                    axis, h, order = arg
-                elif len(arg) == 2:
-                    axis, h = arg
-                    order = 1
-                else:
-                    raise ValueError("Format: (axis, spacing, order=1)")
-                spac[axis] = h
-                if pds is None:
-                    pds = _Diff(axis, order)
-                else:
-                    pd = _Diff(axis, order)
-                    pds = pds * pd
+        if len(args) == 3:
+            axis, h, order = args
+        elif len(args) == 2:
+            axis, h = args
+            order = 1
         else:
-            if len(args) == 3:
-                axis, h, order = args
-            elif len(args) == 2:
-                axis, h = args
-                order = 1
-            else:
-                raise ValueError("Format: (axis, spacing, order=1)")
-            pds = _Diff(axis, order)
+            raise ValueError("Format: (axis, spacing, order=1)")
+        pds = _Diff(axis, order)
 
-            spac[axis] = h
+        spac[axis] = h
 
         # Check if spac is really the spacing and not the coordinates (nonuniform case)
         for a, s in spac.items():
diff --git a/findiff/utils.py b/findiff/utils.py
index 20672c2..2bf3f06 100644
--- a/findiff/utils.py
+++ b/findiff/utils.py
@@ -41,33 +41,36 @@ def to_index_tuple(long_idx, shape):
     return tuple(idx)
 
 
-def deprecated(reason="This feature is deprecated."):
-    def decorator(func_or_class):
-        if isinstance(func_or_class, type):  # Handle classes
-            original_init = func_or_class.__init__
-
-            @wraps(original_init)
-            def new_init(self, *args, **kwargs):
-                warnings.warn(
-                    f"{func_or_class.__name__} is deprecated and will be removed in future versions: {reason}",
-                    category=DeprecationWarning,
-                    stacklevel=2,
-                )
-                original_init(self, *args, **kwargs)
-
-            func_or_class.__init__ = new_init
-            return func_or_class
-
-        # Handle functions
-        @wraps(func_or_class)
-        def wrapped(*args, **kwargs):
-            warnings.warn(
-                f"{func_or_class.__name__} is deprecated: {reason}",
-                category=DeprecationWarning,
-                stacklevel=2,
-            )
-            return func_or_class(*args, **kwargs)
-
-        return wrapped
-
-    return decorator
+#
+# The following is working, but unused yet. Commented because there are no tests yet.
+#
+# def deprecated(reason="This feature is deprecated."):
+#     def decorator(func_or_class):
+#         if isinstance(func_or_class, type):  # Handle classes
+#             original_init = func_or_class.__init__
+#
+#             @wraps(original_init)
+#             def new_init(self, *args, **kwargs):
+#                 warnings.warn(
+#                     f"{func_or_class.__name__} is deprecated and will be removed in future versions: {reason}",
+#                     category=DeprecationWarning,
+#                     stacklevel=2,
+#                 )
+#                 original_init(self, *args, **kwargs)
+#
+#             func_or_class.__init__ = new_init
+#             return func_or_class
+#
+#         # Handle functions
+#         @wraps(func_or_class)
+#         def wrapped(*args, **kwargs):
+#             warnings.warn(
+#                 f"{func_or_class.__name__} is deprecated: {reason}",
+#                 category=DeprecationWarning,
+#                 stacklevel=2,
+#             )
+#             return func_or_class(*args, **kwargs)
+#
+#         return wrapped
+#
+#     return decorator
diff --git a/tests/test_coefs.py b/tests/test_coefs.py
index 61e497d..64637a8 100644
--- a/tests/test_coefs.py
+++ b/tests/test_coefs.py
@@ -1,6 +1,7 @@
 import unittest
 
 import numpy as np
+import pytest
 from sympy import Rational
 
 from findiff import coefficients
@@ -169,6 +170,10 @@ def test_calc_coefs_from_offsets_no_central_point(self):
                     coefs["coefficients"], [-1.0 / 4, 0, 1.0 / 4]
                 )
 
+    def test_calc_coefs_from_offsets_not_enough_points(self):
+        with pytest.raises(ValueError):
+            coefficients(2, offsets=[-2, 2], analytic_inv=False)
+
     def test_calc_coefs_symbolic(self):
         for analytic_inv in [True, False]:
             coefs = calc_coefs(1, [-2, 0, 1], symbolic=True, analytic_inv=analytic_inv)