From 7091f278e619afd7c3fbb7ad2bf66c17f1774284 Mon Sep 17 00:00:00 2001
From: Jacob Walls <jacobtylerwalls@gmail.com>
Date: Sun, 11 Sep 2022 08:08:19 -0400
Subject: [PATCH 1/2] Fix ``unhashable-member`` crash when ``lambda`` used as a
 dict key

---
 doc/whatsnew/fragments/7453.bugfix      |  3 +++
 pylint/checkers/utils.py                | 13 ++++++++++++-
 tests/functional/u/unhashable_member.py |  1 +
 3 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 doc/whatsnew/fragments/7453.bugfix

diff --git a/doc/whatsnew/fragments/7453.bugfix b/doc/whatsnew/fragments/7453.bugfix
new file mode 100644
index 0000000000..94b5240dd4
--- /dev/null
+++ b/doc/whatsnew/fragments/7453.bugfix
@@ -0,0 +1,3 @@
+Fixed a crash in the ``unhashable-member`` checker when using a ``lambda`` as a dict key.
+
+Closes #7453
diff --git a/pylint/checkers/utils.py b/pylint/checkers/utils.py
index 1c66de6878..780806c770 100644
--- a/pylint/checkers/utils.py
+++ b/pylint/checkers/utils.py
@@ -19,7 +19,7 @@
 
 import _string
 import astroid.objects
-from astroid import TooManyLevelsError, nodes
+from astroid import TooManyLevelsError, bases, nodes
 from astroid.context import InferenceContext
 from astroid.exceptions import AstroidError
 from astroid.nodes._base_nodes import ImportNode
@@ -38,6 +38,15 @@
     nodes.DictComp,
     nodes.GeneratorExp,
 )
+WITH_IGETATTR = (
+    nodes.Module,
+    nodes.ClassDef,
+    nodes.FunctionDef,
+    astroid.objects.Super,
+    nodes.Slice,
+    bases.UnboundMethod,
+    bases.BaseInstance,
+)
 EXCEPTIONS_MODULE = "builtins"
 ABC_MODULES = {"abc", "_py_abc"}
 ABC_METHODS = {
@@ -1950,6 +1959,8 @@ def is_hashable(node: nodes.NodeNG) -> bool:
         for inferred in node.infer():
             if inferred is astroid.Uninferable:
                 return True
+            if not isinstance(inferred, WITH_IGETATTR):
+                return True
             hash_fn = next(inferred.igetattr("__hash__"))
             if hash_fn.parent is inferred:
                 return True
diff --git a/tests/functional/u/unhashable_member.py b/tests/functional/u/unhashable_member.py
index 1225543756..a9100b9058 100644
--- a/tests/functional/u/unhashable_member.py
+++ b/tests/functional/u/unhashable_member.py
@@ -21,3 +21,4 @@ class Unhashable:
 {[1, 2, 3]}  # [unhashable-member]
 {"tomato": "tomahto"}
 {dict: {}}
+{lambda x: x: "tomato"}  # pylint: disable=unnecessary-lambda

From a2450c6f4e2532bd3846a3e12872db3b1f896008 Mon Sep 17 00:00:00 2001
From: Jacob Walls <jacobtylerwalls@gmail.com>
Date: Sun, 11 Sep 2022 16:47:07 -0400
Subject: [PATCH 2/2] fixup! Fix ``unhashable-member`` crash

---
 pylint/checkers/utils.py | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/pylint/checkers/utils.py b/pylint/checkers/utils.py
index 780806c770..f0b0de75ca 100644
--- a/pylint/checkers/utils.py
+++ b/pylint/checkers/utils.py
@@ -19,7 +19,7 @@
 
 import _string
 import astroid.objects
-from astroid import TooManyLevelsError, bases, nodes
+from astroid import TooManyLevelsError, nodes
 from astroid.context import InferenceContext
 from astroid.exceptions import AstroidError
 from astroid.nodes._base_nodes import ImportNode
@@ -38,15 +38,6 @@
     nodes.DictComp,
     nodes.GeneratorExp,
 )
-WITH_IGETATTR = (
-    nodes.Module,
-    nodes.ClassDef,
-    nodes.FunctionDef,
-    astroid.objects.Super,
-    nodes.Slice,
-    bases.UnboundMethod,
-    bases.BaseInstance,
-)
 EXCEPTIONS_MODULE = "builtins"
 ABC_MODULES = {"abc", "_py_abc"}
 ABC_METHODS = {
@@ -1959,7 +1950,7 @@ def is_hashable(node: nodes.NodeNG) -> bool:
         for inferred in node.infer():
             if inferred is astroid.Uninferable:
                 return True
-            if not isinstance(inferred, WITH_IGETATTR):
+            if not hasattr(inferred, "igetattr"):
                 return True
             hash_fn = next(inferred.igetattr("__hash__"))
             if hash_fn.parent is inferred: