fix cdef @locals with default arguments

Cython/Compiler/Nodes.py

@@ -1673,6 +1673,11 @@ class CFuncDefNode(FuncDefNode):
         self.directive_locals.update(env.directives['locals'])
         base_type = self.base_type.analyse(env)
         # The 2 here is because we need both function and argument names.
+        if isinstance(self.declarator, CFuncDeclaratorNode):
+            name_declarator, type = self.declarator.analyse(base_type, env,
+                                                            nonempty = 2 * (self.body is not None),
+                                                            directive_locals = self.directive_locals)
+        else:
             name_declarator, type = self.declarator.analyse(base_type, env, nonempty = 2 * (self.body is not None))
         if not type.is_cfunction:
             error(self.pos,

tests/run/cdef_locals_decorator_T477.pyx

@@ -5,6 +5,10 @@ import cython
 cdef func(x):
     return x**2
 
+@cython.locals(x=double)
+cdef func_defval(x=0):
+    return x**2
+
 def test():
     """
     >>> isinstance(test(), float)