gh-120200: Fix `inspect.iscoroutinefunction(inspect) is True` corner case (#120214)

2 files changed, 4 insertions, 3 deletions

diff --git a/Lib/inspect.py b/Lib/inspect.py
index e6e49a4..2b7f8be 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -403,13 +403,13 @@ def isgeneratorfunction(obj):
     return _has_code_flag(obj, CO_GENERATOR)
 
 # A marker for markcoroutinefunction and iscoroutinefunction.
-_is_coroutine_marker = object()
+_is_coroutine_mark = object()
 
 def _has_coroutine_mark(f):
     while ismethod(f):
         f = f.__func__
     f = functools._unwrap_partial(f)
-    return getattr(f, "_is_coroutine_marker", None) is _is_coroutine_marker
+    return getattr(f, "_is_coroutine_marker", None) is _is_coroutine_mark
 
 def markcoroutinefunction(func):
     """
@@ -417,7 +417,7 @@ def markcoroutinefunction(func):
     """
     if hasattr(func, '__func__'):
         func = func.__func__
-    func._is_coroutine_marker = _is_coroutine_marker
+    func._is_coroutine_marker = _is_coroutine_mark
     return func
 
 def iscoroutinefunction(obj):
diff --git a/Lib/test/test_inspect/test_inspect.py b/Lib/test/test_inspect/test_inspect.py
index 65007c1..0a4fa93 100644
--- a/Lib/test/test_inspect/test_inspect.py
+++ b/Lib/test/test_inspect/test_inspect.py
@@ -235,6 +235,7 @@ class TestPredicates(IsTestBase):
                     gen_coroutine_function_example))))
         self.assertFalse(inspect.iscoroutinefunction(gen_coro_pmi))
         self.assertFalse(inspect.iscoroutinefunction(gen_coro_pmc))
+        self.assertFalse(inspect.iscoroutinefunction(inspect))
         self.assertFalse(inspect.iscoroutine(gen_coro))
 
         self.assertTrue(