[Cython] [Bug] Don't compile lambda with tuple argument.

λ $ cat /tmp/test.pyx f = lambda (name,v):True λ $ cython /tmp/test.pyx Error compiling Cython file: ------------------------------------------------------------ ... f = lambda (name,v):True ^ ------------------------------------------------------------ /tmp/test.pyx:1:19: Empty declarator Tested with both 0.21 and 0.23