Rename module to __main__ in embed mode.

This is more consistent with the execution of "python foo.py" and
also allows for compilation of files that don't obey the module
naming rules.

Cython/Compiler/Main.py

@@ -111,7 +111,7 @@ class Context(object):
         return Errors.report_error(exc)
 
     def find_module(self, module_name, relative_to=None, pos=None, need_pxd=1,
-                    check_module_name=True, absolute_fallback=True):
+                    absolute_fallback=True):
         # Finds and returns the module scope corresponding to
         # the given relative or absolute module name. If this
         # is the first time the module has been requested, finds
@@ -138,7 +138,7 @@ class Context(object):
         else:
             qualified_name = module_name
 
-        if check_module_name and not module_name_pattern.match(qualified_name):
+        if not module_name_pattern.match(qualified_name):
             raise CompileError(pos or (module_name, 0, 0),
                                "'%s' is not a valid module name" % module_name)
 

Cython/Compiler/Pipeline.py

@@ -27,11 +27,13 @@ def abort_on_errors(node):
 def parse_stage_factory(context):
     def parse(compsrc):
         source_desc = compsrc.source_desc
+        if Options.embed:
+            full_module_name = "__main__"
+        else:
             full_module_name = compsrc.full_module_name
         initial_pos = (source_desc, 1, 0)
         saved_cimport_from_pyx, Options.cimport_from_pyx = Options.cimport_from_pyx, False
-        scope = context.find_module(full_module_name, pos = initial_pos, need_pxd = 0,
-                                    check_module_name = not Options.embed)
+        scope = context.find_module(full_module_name, pos = initial_pos, need_pxd = 0)
         Options.cimport_from_pyx = saved_cimport_from_pyx
         tree = context.parse(source_desc, scope, pxd = 0, full_module_name = full_module_name)
         tree.compilation_source = compsrc