Remove archaic disable_function_redefinition option.

Cython/Compiler/CmdLine.py

@@ -137,8 +137,6 @@ def parse_command_line(args):
                 Options.warning_errors = True
             elif option in ('-Wextra', '--warning-extra'):
                 options.compiler_directives.update(Options.extra_warnings)
-            elif option == "--disable-function-redefinition":
-                Options.disable_function_redefinition = True
             elif option == "--old-style-globals":
                 Options.old_style_globals = True
             elif option == "--directive" or option.startswith('-X'):

Cython/Compiler/Options.py

@@ -55,10 +55,6 @@ lookup_module_cpdef = False
 # executes the body of this module.
 embed = None
 
-# Disables function redefinition, allowing all functions to be declared at
-# module creation time. For legacy code only, needed for some circular imports.
-disable_function_redefinition = False
-
 # In previous iterations of Cython, globals() gave the first non-Cython module
 # globals in the call stack.  Sage relies on this behavior for variable injection.
 old_style_globals = False

Cython/Compiler/Symtab.py

@@ -631,7 +631,7 @@ class Scope(object):
     def declare_pyfunction(self, name, pos, allow_redefine=False, visibility='extern'):
         # Add an entry for a Python function.
         entry = self.lookup_here(name)
-        if not allow_redefine or Options.disable_function_redefinition:
+        if not allow_redefine:
             return self._declare_pyfunction(name, pos, visibility=visibility, entry=entry)
         if entry:
             if entry.type.is_unspecified: