[Cython] minor bug -- cimport inside function

[David Harvey]

If I run cython on the following file:

=======================
def foo():
     from vial cimport poison
=======================

I get the following traceback:

Traceback (most recent call last):
   File "/Users/david/sage-2.10.2/local/bin/cython", line 8, in <module>
     main(command_line = 1)
   File "/Users/david/sage-2.10.2/local/lib/python2.5/site-packages/ 
Cython/Compiler/Main.py", line 322, in main
     result = context.compile(source, options)
   File "/Users/david/sage-2.10.2/local/lib/python2.5/site-packages/ 
Cython/Compiler/Main.py", line 198, in compile
     tree.process_implementation(scope, options, result)
   File "/Users/david/sage-2.10.2/local/lib/python2.5/site-packages/ 
Cython/Compiler/ModuleNode.py", line 49, in process_implementation
     self.generate_c_code(env, result)
   File "/Users/david/sage-2.10.2/local/lib/python2.5/site-packages/ 
Cython/Compiler/ModuleNode.py", line 219, in generate_c_code
     self.body.generate_function_definitions(env, code)
   File "/Users/david/sage-2.10.2/local/lib/python2.5/site-packages/ 
Cython/Compiler/Nodes.py", line 674, in generate_function_definitions
     self.body.analyse_declarations(lenv)
   File "/Users/david/sage-2.10.2/local/lib/python2.5/site-packages/ 
Cython/Compiler/Nodes.py", line 3331, in analyse_declarations
     module_scope = env.find_module(self.module_name, self.pos)
AttributeError: LocalScope instance has no attribute 'find_module'

david