Fix large integer literal inference.

Cython/Compiler/TypeInference.py

@@ -3,6 +3,7 @@ import ExprNodes
 import Nodes
 import Builtin
 import PyrexTypes
+from Cython import Utils
 from PyrexTypes import py_object_type, unspecified_type
 from Visitor import CythonTransform
 
@@ -176,6 +177,24 @@ class MarkOverflowingArithmetic(CythonTransform):
     
     visit_Node = visit_safe_node
     
+    def visit_assignment(self, lhs, rhs):
+        if (isinstance(rhs, ExprNodes.IntNode) 
+                and isinstance(lhs, ExprNodes.NameNode)
+                and Utils.long_literal(rhs.value)):
+            entry = lhs.entry or self.env.lookup(lhs.name)
+            if entry:
+                entry.might_overflow = True
+    
+    def visit_SingleAssignmentNode(self, node):
+        self.visit_assignment(node.lhs, node.rhs)
+        self.visitchildren(node)
+        return node
+    
+    def visit_CascadedAssignmentNode(self, node):
+        for lhs in node.lhs_list:
+            self.visit_assignment(lhs, node.rhs)
+        self.visitchildren(node)
+        return node
 
 class PyObjectTypeInferer:
     """