python
diff --git a/‎Lib/test/test_builtin.py
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+16Lines changed: 16 additions & 0 deletions b/‎Lib/test/test_builtin.py
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diff --git a/‎Misc/NEWS.d/next/Core and Builtins/2025-02-13-05-09-31.gh-issue-130070.C8c9gK.rst
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+1Lines changed: 1 addition & 0 deletions b/‎Misc/NEWS.d/next/Core and Builtins/2025-02-13-05-09-31.gh-issue-130070.C8c9gK.rst
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diff --git a/‎Python/bltinmodule.c
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@@ -974,8 +974,24 @@ def four_freevars():
             three_freevars.__code__,
             three_freevars.__globals__,
             closure=my_closure)
+        my_closure = tuple(my_closure)
+
+        # should fail: anything passed to closure= isn't allowed
+        # when the source is a string
+        self.assertRaises(TypeError,
+            exec,
+            "pass",
+            closure=int)
+
+        # should fail: correct closure= argument isn't allowed
+        # when the source is a string
+        self.assertRaises(TypeError,
+            exec,
+            "pass",
+            closure=my_closure)
 
         # should fail: closure tuple with one non-cell-var
+        my_closure = list(my_closure)
         my_closure[0] = int
         my_closure = tuple(my_closure)
         self.assertRaises(TypeError,
 
@@ -0,0 +1 @@
+Fixed an assertion error for :func:`exec` passed a string ``source`` and a non-``None`` ``closure``. Patch by Bartosz Sławecki.
@@ -1154,6 +1154,7 @@ builtin_exec_impl(PyObject *module, PyObject *source, PyObject *globals,
         if (closure != NULL) {
             PyErr_SetString(PyExc_TypeError,
                 "closure can only be used when source is a code object");
+            goto error;
         }
         PyObject *source_copy;
         const char *str;
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Fixed an assertion error for :func:`exec` passed a string ``source`` and a non-``None`` ``closure``. Patch by Bartosz Sławecki.
Original file line number	Diff line number	Diff line change
`@@ -1154,6 +1154,7 @@ builtin_exec_impl(PyObject module, PyObject source, PyObject *globals,`
`1154`	`1154`	`if (closure != NULL) {`
`1155`	`1155`	`PyErr_SetString(PyExc_TypeError,`
`1156`	`1156`	`"closure can only be used when source is a code object");`
	`1157`	`+ goto error;`
`1157`	`1158`	`}`
`1158`	`1159`	`PyObject *source_copy;`
`1159`	`1160`	`const char *str;`