Fix `fused_pointer_except_null` test undefined behavior

Signed-off-by: Stefan Behnel <stefan_ml@behnel.de>

tests/run/fused_types.pyx

@@ -119,12 +119,12 @@ def test_fused_with_pointer():
     print
     print fused_with_pointer(string_array).decode('ascii')
 
-cdef fused_type1* fused_pointer_except_null(fused_type1 x) except NULL:
+cdef fused_type1* fused_pointer_except_null(fused_type1* x) except NULL:
     if fused_type1 is string_t:
-        assert(bool(x))
+        assert(bool(x[0]))
     else:
-        assert(x < 10)
-    return &x
+        assert(x[0] < 10)
+    return x
 
 def test_fused_pointer_except_null(value):
     """
@@ -145,11 +145,14 @@ def test_fused_pointer_except_null(value):
     AssertionError
     """
     if isinstance(value, int):
-        print fused_pointer_except_null(<cython.int>value)[0]
+        test_int = cython.declare(cython.int, value)
+        print fused_pointer_except_null(&test_int)[0]
     elif isinstance(value, float):
-        print fused_pointer_except_null(<cython.float>value)[0]
+        test_float = cython.declare(cython.float, value)
+        print fused_pointer_except_null(&test_float)[0]
     elif isinstance(value, bytes):
-        print fused_pointer_except_null(<string_t>value)[0].decode('ascii')
+        test_str = cython.declare(string_t, value)
+        print fused_pointer_except_null(&test_str)[0].decode('ascii')
 
 include "cythonarrayutil.pxi"