gh-141982: Fix pdb can't set breakpoints on async functions (#141983)

Co-authored-by: Tian Gao <gaogaotiantian@hotmail.com>

Lib/pdb.py

@@ -130,7 +130,7 @@ def find_first_executable_line(code):
     return code.co_firstlineno
 
 def find_function(funcname, filename):
-    cre = re.compile(r'def\s+%s(\s*\[.+\])?\s*[(]' % re.escape(funcname))
+    cre = re.compile(r'(?:async\s+)?def\s+%s(\s*\[.+\])?\s*[(]' % re.escape(funcname))
     try:
         fp = tokenize.open(filename)
     except OSError:

Lib/test/test_pdb.py

@@ -4587,6 +4587,25 @@ def bar():
             ]))
             self.assertIn('break in bar', stdout)
 
+    @unittest.skipIf(SKIP_CORO_TESTS, "Coroutine tests are skipped")
+    def test_async_break(self):
+        script = """
+            import asyncio
+
+            async def main():
+                pass
+
+            asyncio.run(main())
+        """
+        commands = """
+            break main
+            continue
+            quit
+        """
+        stdout, stderr = self.run_pdb_script(script, commands)
+        self.assertRegex(stdout, r"Breakpoint 1 at .*main\.py:5")
+        self.assertIn("pass", stdout)
+
     def test_issue_59000(self):
         script = """
             def foo():

Misc/NEWS.d/next/Library/2025-11-30-04-28-30.gh-issue-141982.pxZct9.rst

@@ -0,0 +1 @@
+Allow :mod:`pdb` to set breakpoints on async functions with function names.