gh-116738: Statically initialize special constants in cmath module (gh-142161)

The initialization during `mod_exec` wasn't thread-safe with multiple interpreters.

Author: yoney

Misc/NEWS.d/next/Core_and_Builtins/2025-12-01-10-03-08.gh-issue-116738.972YsG.rst

@@ -0,0 +1,2 @@
+Fix :mod:`cmath` data race when initializing trigonometric tables with
+subinterpreters.

Modules/cmathmodule.c

@@ -163,8 +163,15 @@ special_type(double d)
    raised.
 */
 
-static Py_complex acos_special_values[7][7];
-
+static Py_complex acos_special_values[7][7] = {
+  { {P34,INF}, {P,INF},  {P,INF},  {P,-INF},  {P,-INF},  {P34,-INF}, {N,INF} },
+  { {P12,INF}, {U,U},    {U,U},    {U,U},     {U,U},     {P12,-INF}, {N,N} },
+  { {P12,INF}, {U,U},    {P12,0.}, {P12,-0.}, {U,U},     {P12,-INF}, {P12,N} },
+  { {P12,INF}, {U,U},    {P12,0.}, {P12,-0.}, {U,U},     {P12,-INF}, {P12,N} },
+  { {P12,INF}, {U,U},    {U,U},    {U,U},     {U,U},     {P12,-INF}, {N,N} },
+  { {P14,INF}, {0.,INF}, {0.,INF}, {0.,-INF}, {0.,-INF}, {P14,-INF}, {N,INF} },
+  { {N,INF},   {N,N},    {N,N},    {N,N},     {N,N},     {N,-INF},   {N,N} }
+};
 /*[clinic input]
 cmath.acos -> Py_complex_protected
 
@@ -202,7 +209,15 @@ cmath_acos_impl(PyObject *module, Py_complex z)
 }
 
 
-static Py_complex acosh_special_values[7][7];
+static Py_complex acosh_special_values[7][7] = {
+  { {INF,-P34}, {INF,-P},  {INF,-P},  {INF,P},  {INF,P},  {INF,P34}, {INF,N} },
+  { {INF,-P12}, {U,U},     {U,U},     {U,U},    {U,U},    {INF,P12}, {N,N} },
+  { {INF,-P12}, {U,U},     {0.,-P12}, {0.,P12}, {U,U},    {INF,P12}, {N,P12} },
+  { {INF,-P12}, {U,U},     {0.,-P12}, {0.,P12}, {U,U},    {INF,P12}, {N,P12} },
+  { {INF,-P12}, {U,U},     {U,U},     {U,U},    {U,U},    {INF,P12}, {N,N} },
+  { {INF,-P14}, {INF,-0.}, {INF,-0.}, {INF,0.}, {INF,0.}, {INF,P14}, {INF,N} },
+  { {INF,N},    {N,N},     {N,N},     {N,N},    {N,N},    {INF,N},   {N,N} }
+};
 
 /*[clinic input]
 cmath.acosh = cmath.acos
@@ -257,7 +272,15 @@ cmath_asin_impl(PyObject *module, Py_complex z)
 }
 
 
-static Py_complex asinh_special_values[7][7];
+static Py_complex asinh_special_values[7][7] = {
+  { {-INF,-P14}, {-INF,-0.}, {-INF,-0.}, {-INF,0.}, {-INF,0.}, {-INF,P14}, {-INF,N} },
+  { {-INF,-P12}, {U,U},      {U,U},      {U,U},     {U,U},     {-INF,P12}, {N,N} },
+  { {-INF,-P12}, {U,U},      {-0.,-0.},  {-0.,0.},  {U,U},     {-INF,P12}, {N,N} },
+  { {INF,-P12},  {U,U},      {0.,-0.},   {0.,0.},   {U,U},     {INF,P12},  {N,N} },
+  { {INF,-P12},  {U,U},      {U,U},      {U,U},     {U,U},     {INF,P12},  {N,N} },
+  { {INF,-P14},  {INF,-0.},  {INF,-0.},  {INF,0.},  {INF,0.},  {INF,P14},  {INF,N} },
+  { {INF,N},     {N,N},      {N,-0.},    {N,0.},    {N,N},     {INF,N},    {N,N} }
+};
 
 /*[clinic input]
 cmath.asinh = cmath.acos
@@ -318,7 +341,15 @@ cmath_atan_impl(PyObject *module, Py_complex z)
 }
 
 
-static Py_complex atanh_special_values[7][7];
+static Py_complex atanh_special_values[7][7] = {
+  { {-0.,-P12}, {-0.,-P12}, {-0.,-P12}, {-0.,P12}, {-0.,P12}, {-0.,P12}, {-0.,N} },
+  { {-0.,-P12}, {U,U},      {U,U},      {U,U},     {U,U},     {-0.,P12}, {N,N} },
+  { {-0.,-P12}, {U,U},      {-0.,-0.},  {-0.,0.},  {U,U},     {-0.,P12}, {-0.,N} },
+  { {0.,-P12},  {U,U},      {0.,-0.},   {0.,0.},   {U,U},     {0.,P12},  {0.,N} },
+  { {0.,-P12},  {U,U},      {U,U},      {U,U},     {U,U},     {0.,P12},  {N,N} },
+  { {0.,-P12},  {0.,-P12},  {0.,-P12},  {0.,P12},  {0.,P12},  {0.,P12},  {0.,N} },
+  { {0.,-P12},  {N,N},      {N,N},      {N,N},     {N,N},     {0.,P12},  {N,N} }
+};
 
 /*[clinic input]
 cmath.atanh = cmath.acos
@@ -391,7 +422,15 @@ cmath_cos_impl(PyObject *module, Py_complex z)
 
 
 /* cosh(infinity + i*y) needs to be dealt with specially */
-static Py_complex cosh_special_values[7][7];
+static Py_complex cosh_special_values[7][7] = {
+  { {INF,N}, {U,U}, {INF,0.},  {INF,-0.}, {U,U}, {INF,N}, {INF,N} },
+  { {N,N},   {U,U}, {U,U},     {U,U},     {U,U}, {N,N},   {N,N} },
+  { {N,0.},  {U,U}, {1.,0.},   {1.,-0.},  {U,U}, {N,0.},  {N,0.} },
+  { {N,0.},  {U,U}, {1.,-0.},  {1.,0.},   {U,U}, {N,0.},  {N,0.} },
+  { {N,N},   {U,U}, {U,U},     {U,U},     {U,U}, {N,N},   {N,N} },
+  { {INF,N}, {U,U}, {INF,-0.}, {INF,0.},  {U,U}, {INF,N}, {INF,N} },
+  { {N,N},   {N,N}, {N,0.},    {N,0.},    {N,N}, {N,N},   {N,N} }
+};
 
 /*[clinic input]
 cmath.cosh = cmath.acos
@@ -453,7 +492,15 @@ cmath_cosh_impl(PyObject *module, Py_complex z)
 
 /* exp(infinity + i*y) and exp(-infinity + i*y) need special treatment for
    finite y */
-static Py_complex exp_special_values[7][7];
+static Py_complex exp_special_values[7][7] = {
+  { {0.,0.}, {U,U}, {0.,-0.},  {0.,0.},  {U,U}, {0.,0.}, {0.,0.} },
+  { {N,N},   {U,U}, {U,U},     {U,U},    {U,U}, {N,N},   {N,N} },
+  { {N,N},   {U,U}, {1.,-0.},  {1.,0.},  {U,U}, {N,N},   {N,N} },
+  { {N,N},   {U,U}, {1.,-0.},  {1.,0.},  {U,U}, {N,N},   {N,N} },
+  { {N,N},   {U,U}, {U,U},     {U,U},    {U,U}, {N,N},   {N,N} },
+  { {INF,N}, {U,U}, {INF,-0.}, {INF,0.}, {U,U}, {INF,N}, {INF,N} },
+  { {N,N},   {N,N}, {N,-0.},   {N,0.},   {N,N}, {N,N},   {N,N} }
+};
 
 /*[clinic input]
 cmath.exp = cmath.acos
@@ -512,7 +559,15 @@ cmath_exp_impl(PyObject *module, Py_complex z)
     return r;
 }
 
-static Py_complex log_special_values[7][7];
+static Py_complex log_special_values[7][7] = {
+  { {INF,-P34}, {INF,-P},  {INF,-P},   {INF,P},   {INF,P},  {INF,P34},  {INF,N} },
+  { {INF,-P12}, {U,U},     {U,U},      {U,U},     {U,U},    {INF,P12},  {N,N} },
+  { {INF,-P12}, {U,U},     {-INF,-P},  {-INF,P},  {U,U},    {INF,P12},  {N,N} },
+  { {INF,-P12}, {U,U},     {-INF,-0.}, {-INF,0.}, {U,U},    {INF,P12},  {N,N} },
+  { {INF,-P12}, {U,U},     {U,U},      {U,U},     {U,U},    {INF,P12},  {N,N} },
+  { {INF,-P14}, {INF,-0.}, {INF,-0.},  {INF,0.},  {INF,0.}, {INF,P14},  {INF,N} },
+  { {INF,N},    {N,N},     {N,N},      {N,N},     {N,N},    {INF,N},    {N,N} }
+};
 
 static Py_complex
 c_log(Py_complex z)
@@ -628,7 +683,15 @@ cmath_sin_impl(PyObject *module, Py_complex z)
 
 
 /* sinh(infinity + i*y) needs to be dealt with specially */
-static Py_complex sinh_special_values[7][7];
+static Py_complex sinh_special_values[7][7] = {
+  { {INF,N}, {U,U}, {-INF,-0.}, {-INF,0.}, {U,U}, {INF,N}, {INF,N} },
+  { {N,N},   {U,U}, {U,U},      {U,U},     {U,U}, {N,N},   {N,N} },
+  { {0.,N},  {U,U}, {-0.,-0.},  {-0.,0.},  {U,U}, {0.,N},  {0.,N} },
+  { {0.,N},  {U,U}, {0.,-0.},   {0.,0.},   {U,U}, {0.,N},  {0.,N} },
+  { {N,N},   {U,U}, {U,U},      {U,U},     {U,U}, {N,N},   {N,N} },
+  { {INF,N}, {U,U}, {INF,-0.},  {INF,0.},  {U,U}, {INF,N}, {INF,N} },
+  { {N,N},   {N,N}, {N,-0.},    {N,0.},    {N,N}, {N,N},   {N,N} }
+};
 
 /*[clinic input]
 cmath.sinh = cmath.acos
@@ -687,7 +750,15 @@ cmath_sinh_impl(PyObject *module, Py_complex z)
 }
 
 
-static Py_complex sqrt_special_values[7][7];
+static Py_complex sqrt_special_values[7][7] = {
+  { {INF,-INF}, {0.,-INF}, {0.,-INF}, {0.,INF}, {0.,INF}, {INF,INF}, {N,INF} },
+  { {INF,-INF}, {U,U},     {U,U},     {U,U},    {U,U},    {INF,INF}, {N,N} },
+  { {INF,-INF}, {U,U},     {0.,-0.},  {0.,0.},  {U,U},    {INF,INF}, {N,N} },
+  { {INF,-INF}, {U,U},     {0.,-0.},  {0.,0.},  {U,U},    {INF,INF}, {N,N} },
+  { {INF,-INF}, {U,U},     {U,U},     {U,U},    {U,U},    {INF,INF}, {N,N} },
+  { {INF,-INF}, {INF,-0.}, {INF,-0.}, {INF,0.}, {INF,0.}, {INF,INF}, {INF,N} },
+  { {INF,-INF}, {N,N},     {N,N},     {N,N},    {N,N},    {INF,INF}, {N,N} }
+};
 
 /*[clinic input]
 cmath.sqrt = cmath.acos
@@ -786,7 +857,15 @@ cmath_tan_impl(PyObject *module, Py_complex z)
 
 
 /* tanh(infinity + i*y) needs to be dealt with specially */
-static Py_complex tanh_special_values[7][7];
+static Py_complex tanh_special_values[7][7] = {
+  { {-1.,0.}, {U,U}, {-1.,-0.}, {-1.,0.}, {U,U}, {-1.,0.}, {-1.,0.} },
+  { {N,N},    {U,U}, {U,U},     {U,U},    {U,U}, {N,N},    {N,N} },
+  { {-0.0,N}, {U,U}, {-0.,-0.}, {-0.,0.}, {U,U}, {-0.0,N}, {-0.,N} },
+  { {0.0,N},  {U,U}, {0.,-0.},  {0.,0.},  {U,U}, {0.0,N},  {0.,N} },
+  { {N,N},    {U,U}, {U,U},     {U,U},    {U,U}, {N,N},    {N,N} },
+  { {1.,0.},  {U,U}, {1.,-0.},  {1.,0.},  {U,U}, {1.,0.},  {1.,0.} },
+  { {N,N},    {N,N}, {N,-0.},   {N,0.},   {N,N}, {N,N},    {N,N} }
+};
 
 /*[clinic input]
 cmath.tanh = cmath.acos
@@ -969,7 +1048,15 @@ cmath_polar_impl(PyObject *module, Py_complex z)
 
 */
 
-static Py_complex rect_special_values[7][7];
+static Py_complex rect_special_values[7][7] = {
+  { {INF,N}, {U,U}, {-INF,0.}, {-INF,-0.}, {U,U}, {INF,N}, {INF,N} },
+  { {N,N},   {U,U}, {U,U},     {U,U},      {U,U}, {N,N},   {N,N} },
+  { {0.,0.}, {U,U}, {-0.,0.},  {-0.,-0.},  {U,U}, {0.,0.}, {0.,0.} },
+  { {0.,0.}, {U,U}, {0.,-0.},  {0.,0.},    {U,U}, {0.,0.}, {0.,0.} },
+  { {N,N},   {U,U}, {U,U},     {U,U},      {U,U}, {N,N},   {N,N} },
+  { {INF,N}, {U,U}, {INF,-0.}, {INF,0.},   {U,U}, {INF,N}, {INF,N} },
+  { {N,N},   {N,N}, {N,0.},    {N,0.},     {N,N}, {N,N},   {N,N} }
+};
 
 /*[clinic input]
 cmath.rect
@@ -1202,120 +1289,6 @@ cmath_exec(PyObject *mod)
         return -1;
     }
 
-    /* initialize special value tables */
-
-#define INIT_SPECIAL_VALUES(NAME, BODY) { Py_complex* p = (Py_complex*)NAME; BODY }
-#define C(REAL, IMAG) p->real = REAL; p->imag = IMAG; ++p;
-
-    INIT_SPECIAL_VALUES(acos_special_values, {
-      C(P34,INF) C(P,INF)  C(P,INF)  C(P,-INF)  C(P,-INF)  C(P34,-INF) C(N,INF)
-      C(P12,INF) C(U,U)    C(U,U)    C(U,U)     C(U,U)     C(P12,-INF) C(N,N)
-      C(P12,INF) C(U,U)    C(P12,0.) C(P12,-0.) C(U,U)     C(P12,-INF) C(P12,N)
-      C(P12,INF) C(U,U)    C(P12,0.) C(P12,-0.) C(U,U)     C(P12,-INF) C(P12,N)
-      C(P12,INF) C(U,U)    C(U,U)    C(U,U)     C(U,U)     C(P12,-INF) C(N,N)
-      C(P14,INF) C(0.,INF) C(0.,INF) C(0.,-INF) C(0.,-INF) C(P14,-INF) C(N,INF)
-      C(N,INF)   C(N,N)    C(N,N)    C(N,N)     C(N,N)     C(N,-INF)   C(N,N)
-    })
-
-    INIT_SPECIAL_VALUES(acosh_special_values, {
-      C(INF,-P34) C(INF,-P)  C(INF,-P)  C(INF,P)  C(INF,P)  C(INF,P34) C(INF,N)
-      C(INF,-P12) C(U,U)     C(U,U)     C(U,U)    C(U,U)    C(INF,P12) C(N,N)
-      C(INF,-P12) C(U,U)     C(0.,-P12) C(0.,P12) C(U,U)    C(INF,P12) C(N,P12)
-      C(INF,-P12) C(U,U)     C(0.,-P12) C(0.,P12) C(U,U)    C(INF,P12) C(N,P12)
-      C(INF,-P12) C(U,U)     C(U,U)     C(U,U)    C(U,U)    C(INF,P12) C(N,N)
-      C(INF,-P14) C(INF,-0.) C(INF,-0.) C(INF,0.) C(INF,0.) C(INF,P14) C(INF,N)
-      C(INF,N)    C(N,N)     C(N,N)     C(N,N)    C(N,N)    C(INF,N)   C(N,N)
-    })
-
-    INIT_SPECIAL_VALUES(asinh_special_values, {
-      C(-INF,-P14) C(-INF,-0.) C(-INF,-0.) C(-INF,0.) C(-INF,0.) C(-INF,P14) C(-INF,N)
-      C(-INF,-P12) C(U,U)      C(U,U)      C(U,U)     C(U,U)     C(-INF,P12) C(N,N)
-      C(-INF,-P12) C(U,U)      C(-0.,-0.)  C(-0.,0.)  C(U,U)     C(-INF,P12) C(N,N)
-      C(INF,-P12)  C(U,U)      C(0.,-0.)   C(0.,0.)   C(U,U)     C(INF,P12)  C(N,N)
-      C(INF,-P12)  C(U,U)      C(U,U)      C(U,U)     C(U,U)     C(INF,P12)  C(N,N)
-      C(INF,-P14)  C(INF,-0.)  C(INF,-0.)  C(INF,0.)  C(INF,0.)  C(INF,P14)  C(INF,N)
-      C(INF,N)     C(N,N)      C(N,-0.)    C(N,0.)    C(N,N)     C(INF,N)    C(N,N)
-    })
-
-    INIT_SPECIAL_VALUES(atanh_special_values, {
-      C(-0.,-P12) C(-0.,-P12) C(-0.,-P12) C(-0.,P12) C(-0.,P12) C(-0.,P12) C(-0.,N)
-      C(-0.,-P12) C(U,U)      C(U,U)      C(U,U)     C(U,U)     C(-0.,P12) C(N,N)
-      C(-0.,-P12) C(U,U)      C(-0.,-0.)  C(-0.,0.)  C(U,U)     C(-0.,P12) C(-0.,N)
-      C(0.,-P12)  C(U,U)      C(0.,-0.)   C(0.,0.)   C(U,U)     C(0.,P12)  C(0.,N)
-      C(0.,-P12)  C(U,U)      C(U,U)      C(U,U)     C(U,U)     C(0.,P12)  C(N,N)
-      C(0.,-P12)  C(0.,-P12)  C(0.,-P12)  C(0.,P12)  C(0.,P12)  C(0.,P12)  C(0.,N)
-      C(0.,-P12)  C(N,N)      C(N,N)      C(N,N)     C(N,N)     C(0.,P12)  C(N,N)
-    })
-
-    INIT_SPECIAL_VALUES(cosh_special_values, {
-      C(INF,N) C(U,U) C(INF,0.)  C(INF,-0.) C(U,U) C(INF,N) C(INF,N)
-      C(N,N)   C(U,U) C(U,U)     C(U,U)     C(U,U) C(N,N)   C(N,N)
-      C(N,0.)  C(U,U) C(1.,0.)   C(1.,-0.)  C(U,U) C(N,0.)  C(N,0.)
-      C(N,0.)  C(U,U) C(1.,-0.)  C(1.,0.)   C(U,U) C(N,0.)  C(N,0.)
-      C(N,N)   C(U,U) C(U,U)     C(U,U)     C(U,U) C(N,N)   C(N,N)
-      C(INF,N) C(U,U) C(INF,-0.) C(INF,0.)  C(U,U) C(INF,N) C(INF,N)
-      C(N,N)   C(N,N) C(N,0.)    C(N,0.)    C(N,N) C(N,N)   C(N,N)
-    })
-
-    INIT_SPECIAL_VALUES(exp_special_values, {
-      C(0.,0.) C(U,U) C(0.,-0.)  C(0.,0.)  C(U,U) C(0.,0.) C(0.,0.)
-      C(N,N)   C(U,U) C(U,U)     C(U,U)    C(U,U) C(N,N)   C(N,N)
-      C(N,N)   C(U,U) C(1.,-0.)  C(1.,0.)  C(U,U) C(N,N)   C(N,N)
-      C(N,N)   C(U,U) C(1.,-0.)  C(1.,0.)  C(U,U) C(N,N)   C(N,N)
-      C(N,N)   C(U,U) C(U,U)     C(U,U)    C(U,U) C(N,N)   C(N,N)
-      C(INF,N) C(U,U) C(INF,-0.) C(INF,0.) C(U,U) C(INF,N) C(INF,N)
-      C(N,N)   C(N,N) C(N,-0.)   C(N,0.)   C(N,N) C(N,N)   C(N,N)
-    })
-
-    INIT_SPECIAL_VALUES(log_special_values, {
-      C(INF,-P34) C(INF,-P)  C(INF,-P)   C(INF,P)   C(INF,P)  C(INF,P34)  C(INF,N)
-      C(INF,-P12) C(U,U)     C(U,U)      C(U,U)     C(U,U)    C(INF,P12)  C(N,N)
-      C(INF,-P12) C(U,U)     C(-INF,-P)  C(-INF,P)  C(U,U)    C(INF,P12)  C(N,N)
-      C(INF,-P12) C(U,U)     C(-INF,-0.) C(-INF,0.) C(U,U)    C(INF,P12)  C(N,N)
-      C(INF,-P12) C(U,U)     C(U,U)      C(U,U)     C(U,U)    C(INF,P12)  C(N,N)
-      C(INF,-P14) C(INF,-0.) C(INF,-0.)  C(INF,0.)  C(INF,0.) C(INF,P14)  C(INF,N)
-      C(INF,N)    C(N,N)     C(N,N)      C(N,N)     C(N,N)    C(INF,N)    C(N,N)
-    })
-
-    INIT_SPECIAL_VALUES(sinh_special_values, {
-      C(INF,N) C(U,U) C(-INF,-0.) C(-INF,0.) C(U,U) C(INF,N) C(INF,N)
-      C(N,N)   C(U,U) C(U,U)      C(U,U)     C(U,U) C(N,N)   C(N,N)
-      C(0.,N)  C(U,U) C(-0.,-0.)  C(-0.,0.)  C(U,U) C(0.,N)  C(0.,N)
-      C(0.,N)  C(U,U) C(0.,-0.)   C(0.,0.)   C(U,U) C(0.,N)  C(0.,N)
-      C(N,N)   C(U,U) C(U,U)      C(U,U)     C(U,U) C(N,N)   C(N,N)
-      C(INF,N) C(U,U) C(INF,-0.)  C(INF,0.)  C(U,U) C(INF,N) C(INF,N)
-      C(N,N)   C(N,N) C(N,-0.)    C(N,0.)    C(N,N) C(N,N)   C(N,N)
-    })
-
-    INIT_SPECIAL_VALUES(sqrt_special_values, {
-      C(INF,-INF) C(0.,-INF) C(0.,-INF) C(0.,INF) C(0.,INF) C(INF,INF) C(N,INF)
-      C(INF,-INF) C(U,U)     C(U,U)     C(U,U)    C(U,U)    C(INF,INF) C(N,N)
-      C(INF,-INF) C(U,U)     C(0.,-0.)  C(0.,0.)  C(U,U)    C(INF,INF) C(N,N)
-      C(INF,-INF) C(U,U)     C(0.,-0.)  C(0.,0.)  C(U,U)    C(INF,INF) C(N,N)
-      C(INF,-INF) C(U,U)     C(U,U)     C(U,U)    C(U,U)    C(INF,INF) C(N,N)
-      C(INF,-INF) C(INF,-0.) C(INF,-0.) C(INF,0.) C(INF,0.) C(INF,INF) C(INF,N)
-      C(INF,-INF) C(N,N)     C(N,N)     C(N,N)    C(N,N)    C(INF,INF) C(N,N)
-    })
-
-    INIT_SPECIAL_VALUES(tanh_special_values, {
-      C(-1.,0.) C(U,U) C(-1.,-0.) C(-1.,0.) C(U,U) C(-1.,0.) C(-1.,0.)
-      C(N,N)    C(U,U) C(U,U)     C(U,U)    C(U,U) C(N,N)    C(N,N)
-      C(-0.0,N)    C(U,U) C(-0.,-0.) C(-0.,0.) C(U,U) C(-0.0,N)    C(-0.,N)
-      C(0.0,N)    C(U,U) C(0.,-0.)  C(0.,0.)  C(U,U) C(0.0,N)    C(0.,N)
-      C(N,N)    C(U,U) C(U,U)     C(U,U)    C(U,U) C(N,N)    C(N,N)
-      C(1.,0.)  C(U,U) C(1.,-0.)  C(1.,0.)  C(U,U) C(1.,0.)  C(1.,0.)
-      C(N,N)    C(N,N) C(N,-0.)   C(N,0.)   C(N,N) C(N,N)    C(N,N)
-    })
-
-    INIT_SPECIAL_VALUES(rect_special_values, {
-      C(INF,N) C(U,U) C(-INF,0.) C(-INF,-0.) C(U,U) C(INF,N) C(INF,N)
-      C(N,N)   C(U,U) C(U,U)     C(U,U)      C(U,U) C(N,N)   C(N,N)
-      C(0.,0.) C(U,U) C(-0.,0.)  C(-0.,-0.)  C(U,U) C(0.,0.) C(0.,0.)
-      C(0.,0.) C(U,U) C(0.,-0.)  C(0.,0.)    C(U,U) C(0.,0.) C(0.,0.)
-      C(N,N)   C(U,U) C(U,U)     C(U,U)      C(U,U) C(N,N)   C(N,N)
-      C(INF,N) C(U,U) C(INF,-0.) C(INF,0.)   C(U,U) C(INF,N) C(INF,N)
-      C(N,N)   C(N,N) C(N,0.)    C(N,0.)     C(N,N) C(N,N)   C(N,N)
-    })
     return 0;
 }