prevent auto_cpdef from breaking module-level lambdas

Cython/Compiler/ParseTreeTransforms.py

@@ -2031,6 +2031,10 @@ class AlignFunctionDefinitions(CythonTransform):
         # self.visitchildren(node)
         return node
 
+    def visit_ExprNode(self, node):
+        # ignore lambdas and everything else that appears in expressions
+        return node
+
 
 class RemoveUnreachableCode(CythonTransform):
     def visit_Node(self, node):

tests/run/auto_cpdef.py

@@ -37,3 +37,11 @@ def starstararg_func(**kwargs):
     1
     """
     return kwargs['a']
+
+l = lambda x: 1
+
+def test_lambda():
+    """
+    >>> l(1)
+    1
+    """