From 7be6350ecc43255b486f99648065453080f5f286 Mon Sep 17 00:00:00 2001
From: Kevin Kannammalil <kevinrk2000@gmail.com>
Date: Tue, 5 May 2026 00:08:25 -0400
Subject: [PATCH] added note to too_many_positional_arguments

---
 mypy/messages.py                       |  1 +
 test-data/unit/check-kwargs.test       | 15 +++++++++++++++
 test-data/unit/check-namedtuple.test   |  1 +
 test-data/unit/check-type-aliases.test |  1 +
 4 files changed, 18 insertions(+)

diff --git a/mypy/messages.py b/mypy/messages.py
index 3de66c7c6082c..b4a92a02fde03 100644
--- a/mypy/messages.py
+++ b/mypy/messages.py
@@ -972,6 +972,7 @@ def too_many_positional_arguments(self, callee: CallableType, context: Context)
             msg = "Too many positional arguments" + for_function(callee)
         self.fail(msg, context)
         self.maybe_note_about_special_args(callee, context)
+        self.note_defined_here(callee, context)
 
     def maybe_note_about_special_args(self, callee: CallableType, context: Context) -> None:
         if self.prefer_simple_messages():
diff --git a/test-data/unit/check-kwargs.test b/test-data/unit/check-kwargs.test
index f11c2b6f4fc40..6f5e11d85ee48 100644
--- a/test-data/unit/check-kwargs.test
+++ b/test-data/unit/check-kwargs.test
@@ -495,6 +495,21 @@ def f(a: int, *, b: str) -> None:
     pass
 f(1)  # E: Missing named argument "b" for "f"
 
+[case testTooManyPositionalArgumentsFromOtherModule]
+import m
+m.f(1, 2)
+[file m.py]
+def f(a: int, *, b: int) -> None:
+    pass
+[out]
+main:2: error: Too many positional arguments for "f"
+main:2: note: "f" defined in "m"
+
+[case testTooManyPositionalArgumentsForSameModule]
+def f(a: int, *, b: int) -> None:
+    pass
+f(1, 2)  # E: Too many positional arguments for "f"
+
 [case testStarArgsAndKwArgsSpecialCase]
 from typing import Dict, Mapping
 
diff --git a/test-data/unit/check-namedtuple.test b/test-data/unit/check-namedtuple.test
index 285ae92325d8e..158b95aa598d0 100644
--- a/test-data/unit/check-namedtuple.test
+++ b/test-data/unit/check-namedtuple.test
@@ -132,6 +132,7 @@ main:5: error: Argument "rename" to "namedtuple" has incompatible type "str"; ex
 main:6: error: Unexpected keyword argument "unrecognized_arg" for "namedtuple"
 main:6: note: "namedtuple" defined in "collections"
 main:7: error: Too many positional arguments for "namedtuple"
+main:7: note: "namedtuple" defined in "collections"
 
 [case testNamedTupleDefaults]
 from collections import namedtuple
diff --git a/test-data/unit/check-type-aliases.test b/test-data/unit/check-type-aliases.test
index 4d68f93a21eda..e48700c69e38e 100644
--- a/test-data/unit/check-type-aliases.test
+++ b/test-data/unit/check-type-aliases.test
@@ -1112,6 +1112,7 @@ reveal_type(t3)  # N: Revealed type is "Any"
 
 T4 = TypeAliasType("T4")  # E: Missing positional argument "value" in call to "TypeAliasType"
 T5 = TypeAliasType("T5", int, str)  # E: Too many positional arguments for "TypeAliasType" \
+                                    # N: "TypeAliasType" defined in "typing_extensions" \
                                     # E: Argument 3 to "TypeAliasType" has incompatible type "type[str]"; expected "tuple[TypeVar? | ParamSpec? | TypeVarTuple?, ...]"
 [builtins fixtures/tuple.pyi]
 [typing fixtures/typing-full.pyi]