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gh-109118: Make comprehensions work within annotation scopes, but without inlining#118160

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JelleZijlstra merged 7 commits intopython:mainfromJelleZijlstra:lambdaanno
Apr 28, 2024
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Rename "error_cases"
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@JelleZijlstra
JelleZijlstra committedApr 26, 2024
commit79e9332f87e5f4a051d03eb52e1dae795d9ae18d
4 changes: 3 additions & 1 deletionDoc/whatsnew/3.13.rst
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Expand Up@@ -276,7 +276,9 @@ Other Language Changes
(Contributed by Pedro Sousa Lacerda in :gh:`66449`.)

* :ref:`annotation scope <annotation-scopes>` within class scopes can now
contain lambdas. (Contributed by Jelle Zijlstra in :gh:`109118`.)
contain lambdas and comprehensions. Comprehensions that are located within
class scopes are not inliked into their parent scope. (Contributed by
Jelle Zijlstra in :gh:`109118` and :gh:`118160`.)


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4 changes: 2 additions & 2 deletionsLib/test/test_type_params.py
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Expand Up@@ -491,13 +491,13 @@ class C:
T = "class"
{}
"""
error_cases = [
cases = [
"type Alias[T] = (T for _ in (1,))",
"type Alias = (T for _ in (1,))",
"type Alias[T] = [T for _ in (1,)]",
"type Alias = [T for _ in (1,)]",
]
for case inerror_cases:
for case incases:
with self.subTest(case=case):
ns = run_code(code.format(case))
alias = ns["C"].Alias
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6 changes: 4 additions & 2 deletionsPython/symtable.c
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Expand Up@@ -1154,10 +1154,12 @@ analyze_block(PySTEntryObject *ste, PyObject *bound, PyObject *free,
}
}

// we inline all non-generator-expression comprehensions
// we inline all non-generator-expression comprehensions,
// except those in annotation scopes that are nested in classes
int inline_comp =
entry->ste_comprehension &&
!entry->ste_generator;
!entry->ste_generator &&
!ste->ste_can_see_class_scope;

if (!analyze_child_block(entry, newbound, newfree, newglobal,
type_params, new_class_entry, &child_free))
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