Fix unhashable-member crash when lambda used as a dict key (#7454)

pylint-dev · Sep 19, 2022 · 9b359ad · 9b359ad
1 parent 5716ad1
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diff --git a/doc/whatsnew/fragments/7453.bugfix 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
@@ -1942,6 +1942,8 @@ def is_hashable(node: nodes.NodeNG) -> bool:
         for inferred in node.infer():
             if inferred is astroid.Uninferable:
                 return True
+            if not hasattr(inferred, "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
@@ -21,3 +21,4 @@ class Unhashable:
 {[1, 2, 3]}  # [unhashable-member]
 {"tomato": "tomahto"}
 {dict: {}}
+{lambda x: x: "tomato"}  # pylint: disable=unnecessary-lambda