From 41b622b1e8736bd86c8dc2e1471121d5f6a88937 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Sun, 28 May 2023 04:18:43 -0700
Subject: [PATCH] [3.12] gh-105013: Fix inspect.getsource with parenthesized
 multiline lambdas (GH-105021) (#105032)

gh-105013: Fix inspect.getsource with parenthesized multiline lambdas (GH-105021)
(cherry picked from commit 3a5be878be6f89ee98d0ef9a1274e6a9d9ccbc37)

Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>
---
 Lib/inspect.py                                  |  8 ++++++++
 Lib/test/inspect_fodder2.py                     | 17 +++++++++++++++++
 Lib/test/test_inspect.py                        | 16 ++++++++++++++++
 ...23-05-27-16-57-11.gh-issue-105013.IsDgDY.rst |  2 ++
 4 files changed, 43 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2023-05-27-16-57-11.gh-issue-105013.IsDgDY.rst

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 7709a95003efbd..55530fc780b35c 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1242,6 +1242,14 @@ def getblock(lines):
             blockfinder.tokeneater(*_token)
     except (EndOfBlock, IndentationError):
         pass
+    except SyntaxError as e:
+        if "unmatched" not in e.msg:
+            raise e from None
+        _, *_token_info = _token
+        try:
+            blockfinder.tokeneater(tokenize.NEWLINE, *_token_info)
+        except (EndOfBlock, IndentationError):
+            pass
     return lines[:blockfinder.last]
 
 def getsourcelines(object):
diff --git a/Lib/test/inspect_fodder2.py b/Lib/test/inspect_fodder2.py
index 2dc49817087c44..03464613694605 100644
--- a/Lib/test/inspect_fodder2.py
+++ b/Lib/test/inspect_fodder2.py
@@ -273,3 +273,20 @@ def wrapper(*a, **kwd):
 @deco_factory(foo=(1 + 2), bar=lambda: 1)
 def complex_decorated(foo=0, bar=lambda: 0):
     return foo + bar()
+
+# line 276
+parenthesized_lambda = (
+    lambda: ())
+parenthesized_lambda2 = [
+    lambda: ()][0]
+parenthesized_lambda3 = {0:
+    lambda: ()}[0]
+
+# line 285
+post_line_parenthesized_lambda1 = (lambda: ()
+)
+
+# line 289
+nested_lambda = (
+    lambda right: [].map(
+        lambda length: ()))
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index ade32151eaf233..a7bd680d0f5bcc 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -776,6 +776,22 @@ def test_twoline_indented_lambda(self):
         # where the second line _is_ indented.
         self.assertSourceEqual(mod2.tlli, 33, 34)
 
+    def test_parenthesized_multiline_lambda(self):
+        # Test inspect.getsource with a parenthesized multi-line lambda
+        # function.
+        self.assertSourceEqual(mod2.parenthesized_lambda, 279, 279)
+        self.assertSourceEqual(mod2.parenthesized_lambda2, 281, 281)
+        self.assertSourceEqual(mod2.parenthesized_lambda3, 283, 283)
+
+    def test_post_line_parenthesized_lambda(self):
+        # Test inspect.getsource with a parenthesized multi-line lambda
+        # function.
+        self.assertSourceEqual(mod2.post_line_parenthesized_lambda1, 286, 287)
+
+    def test_nested_lambda(self):
+        # Test inspect.getsource with a nested lambda function.
+        self.assertSourceEqual(mod2.nested_lambda, 291, 292)
+
     def test_onelinefunc(self):
         # Test inspect.getsource with a regular one-line function.
         self.assertSourceEqual(mod2.onelinefunc, 37, 37)
diff --git a/Misc/NEWS.d/next/Core and Builtins/2023-05-27-16-57-11.gh-issue-105013.IsDgDY.rst b/Misc/NEWS.d/next/Core and Builtins/2023-05-27-16-57-11.gh-issue-105013.IsDgDY.rst
new file mode 100644
index 00000000000000..a9917c2849982a
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2023-05-27-16-57-11.gh-issue-105013.IsDgDY.rst	
@@ -0,0 +1,2 @@
+Fix handling of multiline parenthesized lambdas in
+:func:`inspect.getsource`. Patch by Pablo Galindo