raise error if trying to run a cte and using --with

src/sql/magic.py

@@ -426,6 +426,11 @@ def interactive_execute_wrapper(**kwargs):
                 else:
                     with_ = None
         else:
+            if args.with_:
+                raise exceptions.UsageError(
+                    "Cannot use --with with CTEs, remove --with and re-run the cell"
+                )
+
             with_ = None
 
         # Create the interactive slider

src/tests/test_magic.py

@@ -1700,3 +1700,36 @@ def test_can_run_cte_that_references_a_table_whose_name_is_the_same_as_a_snippet
         "last_name": ("Shakespeare",),
         "year_of_death": (1616,),
     }
+
+
+def test_error_when_running_a_cte_and_passing_with_argument(ip):
+    # randomize the name to avoid collisions
+    identifier = "shakespeare_" + str(uuid.uuid4())[:8]
+
+    # create table
+    ip.run_cell(
+        f"""%%sql
+create table {identifier} as select * from author where last_name = 'Shakespeare'
+"""
+    )
+
+    # store a snippet with the same name
+    ip.run_cell(
+        f"""%%sql --save {identifier}
+select * from author where last_name = 'some other last name'
+"""
+    )
+
+    with pytest.raises(UsageError) as excinfo:
+        ip.run_cell(
+            f"""%%sql --with {identifier}
+with author_subset as (
+    select * from {identifier}
+)
+select * from author_subset
+"""
+        )
+
+    assert "Cannot use --with with CTEs, remove --with and re-run the cell" in str(
+        excinfo.value
+    )