test for C arrays and their declaration

tests/run/carrays.pyx

+__doc__ = """
+>>> test()
+2
+"""
+
+def test():
+    cdef int x[2][2]
+    x[0][0] = 1
+    x[0][1] = 2
+    x[1][0] = 3
+    x[1][1] = 4
+    return f(x)[1]
+
+cdef int* f(int x[2][2]):
+    return x[0]