bad code segment crashes cython

[hoytak]

Hello,

The following (bad) code segment crashes cython:

cdef class A:
    return None

The traceback is:

  File "/home/hoytak/sysroot/lib/python2.5/site-packages/Cython/Distutils/build_ext.py", line 196, in cython_sources
    full_module_name=module_name)
  File "/home/hoytak/sysroot/lib/python2.5/site-packages/Cython/Compiler/Main.py", line 692, in compile
    return compile_single(source, options, full_module_name)
  File "/home/hoytak/sysroot/lib/python2.5/site-packages/Cython/Compiler/Main.py", line 637, in compile_single
    return run_pipeline(source, options, full_module_name)
  File "/home/hoytak/sysroot/lib/python2.5/site-packages/Cython/Compiler/Main.py", line 526, in run_pipeline
    err, enddata = context.run_pipeline(pipeline, source)
  File "/home/hoytak/sysroot/lib/python2.5/site-packages/Cython/Compiler/Main.py", line 185, in run_pipeline
    data = phase(data)
  File "Visitor.py", line 177, in Cython.Compiler.Visitor.CythonTransform.__call__ (/home/hoytak/sysroot/src/cython/Cython/Compiler/Visitor.c:2162)
  File "Visitor.py", line 163, in Cython.Compiler.Visitor.VisitorTransform.__call__ (/home/hoytak/sysroot/src/cython/Cython/Compiler/Visitor.c:1924)
  File "Visitor.py", line 43, in Cython.Compiler.Visitor.BasicVisitor.visit (/home/hoytak/sysroot/src/cython/Cython/Compiler/Visitor.c:901)
  File "/home/hoytak/sysroot/lib/python2.5/site-packages/Cython/Compiler/ParseTreeTransforms.py", line 605, in visit_ModuleNode
    node.body.analyse_expressions(node.scope)
  File "/home/hoytak/sysroot/lib/python2.5/site-packages/Cython/Compiler/Nodes.py", line 318, in analyse_expressions
    stat.analyse_expressions(env)
  File "/home/hoytak/sysroot/lib/python2.5/site-packages/Cython/Compiler/Nodes.py", line 2534, in analyse_expressions
    self.body.analyse_expressions(scope)
  File "/home/hoytak/sysroot/lib/python2.5/site-packages/Cython/Compiler/Nodes.py", line 318, in analyse_expressions
    stat.analyse_expressions(env)
  File "/home/hoytak/sysroot/lib/python2.5/site-packages/Cython/Compiler/Nodes.py", line 3224, in analyse_expressions
    return_type = env.return_type
AttributeError: CClassScope instance has no attribute 'return_type'

I'm using changset 1374

--Hoyt

[ksmith]

See above patch for a possible fix.

In the Scope object initialization, it sets the return_type to None; this covers both cases when there is a return in the module scope and a class scope.

Test case in the patch too.

[scoder]

The proposed patch does not fix the underlying problem that the "return_type" should not be accessed before the code generation phase.

This should be fixed as part of the refactoring for ticket #144.