fix list comprehensions as if conditions

Cython/Compiler/Nodes.py

@@ -4035,7 +4035,6 @@ class IfClauseNode(Node):
         self.body.analyse_control_flow(env)
         
     def analyse_declarations(self, env):
-        self.condition.analyse_declarations(env)
         self.body.analyse_declarations(env)
     
     def analyse_expressions(self, env):

tests/run/cython3.pyx

@@ -64,6 +64,19 @@ def list_comp_unknown_type(l):
     """
     return [x*2 for x in l if x % 2 == 0]
 
+def listcomp_as_condition(sequence):
+    """
+    >>> listcomp_as_condition(['a', 'b', '+'])
+    True
+    >>> listcomp_as_condition('ab+')
+    True
+    >>> listcomp_as_condition('abc')
+    False
+    """
+    if [1 for c in sequence if c in '+-*/<=>!%&|([^~,']:
+        return True
+    return False
+
 def set_comp():
     """
     >>> sorted(set_comp())

tests/run/listcomp.pyx

@@ -63,3 +63,16 @@ def nested_result():
     """
     result = [[a-1 for a in range(b)] for b in range(4)]
     return result
+
+def listcomp_as_condition(sequence):
+    """
+    >>> listcomp_as_condition(['a', 'b', '+'])
+    True
+    >>> listcomp_as_condition('ab+')
+    True
+    >>> listcomp_as_condition('abc')
+    False
+    """
+    if [1 for c in sequence if c in '+-*/<=>!%&|([^~,']:
+        return True
+    return False