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[3.12] gh-119666: fix multiple class-scope comprehensions referencing __class__ (GH-120295) (#120300)
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@ -168,6 +168,31 @@ def test_references___class__(self):
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"""
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self._check_in_scopes(code, raises=NameError)
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def test_references___class___defined(self):
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code = """
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__class__ = 2
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res = [__class__ for x in [1]]
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"""
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self._check_in_scopes(
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code, outputs={"res": [2]}, scopes=["module", "function"])
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self._check_in_scopes(code, raises=NameError, scopes=["class"])
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def test_references___class___enclosing(self):
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code = """
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__class__ = 2
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class C:
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res = [__class__ for x in [1]]
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res = C.res
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"""
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self._check_in_scopes(code, raises=NameError)
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def test_super_and_class_cell_in_sibling_comps(self):
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code = """
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[super for _ in [1]]
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[__class__ for _ in [1]]
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"""
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self._check_in_scopes(code, raises=NameError)
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def test_inner_cell_shadows_outer(self):
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code = """
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items = [(lambda: i) for i in range(5)]
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@ -0,0 +1 @@
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Fix a compiler crash in the case where two comprehensions in class scope both reference ``__class__``.
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@ -675,22 +675,19 @@ inline_comprehension(PySTEntryObject *ste, PySTEntryObject *comp,
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if (existing == NULL && PyErr_Occurred()) {
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return 0;
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}
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// __class__ is never allowed to be free through a class scope (see
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// drop_class_free)
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if (scope == FREE && ste->ste_type == ClassBlock &&
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_PyUnicode_EqualToASCIIString(k, "__class__")) {
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scope = GLOBAL_IMPLICIT;
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if (PySet_Discard(comp_free, k) < 0) {
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return 0;
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}
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remove_dunder_class = 1;
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}
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if (!existing) {
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// name does not exist in scope, copy from comprehension
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assert(scope != FREE || PySet_Contains(comp_free, k) == 1);
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if (scope == FREE && ste->ste_type == ClassBlock &&
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_PyUnicode_EqualToASCIIString(k, "__class__")) {
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// if __class__ is unbound in the enclosing class scope and free
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// in the comprehension scope, it needs special handling; just
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// letting it be marked as free in class scope will break due to
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// drop_class_free
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scope = GLOBAL_IMPLICIT;
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only_flags &= ~DEF_FREE;
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if (PySet_Discard(comp_free, k) < 0) {
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return 0;
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}
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remove_dunder_class = 1;
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}
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PyObject *v_flags = PyLong_FromLong(only_flags);
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if (v_flags == NULL) {
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return 0;
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