work around missing temp variable declaration when a multiplied tuple ends up as cached constant

Cython/Compiler/ExprNodes.py

@@ -4432,8 +4432,17 @@ class SequenceNode(ExprNode):
             code.error_goto_if_null(self.result(), self.pos)))
         code.put_gotref(self.py_result())
         if mult:
-            counter = code.funcstate.allocate_temp(self.mult_factor.type, manage_ref=False)
-            offset = '%s * %s + ' % (counter, arg_count)
+            # FIXME: can't use a temp variable here as the code may
+            # end up in the constant building function.  Temps
+            # currently don't work there.
+
+            #counter = code.funcstate.allocate_temp(self.mult_factor.type, manage_ref=False)
+            counter = '__pyx_n'
+            code.putln('{ Py_ssize_t %s;' % counter)
+            if arg_count == 1:
+                offset = counter + ' + '
+            else:
+                offset = '%s * %s + ' % (counter, arg_count)
             code.putln('for (%s=0; %s < %s; %s++) {' % (
                 counter, counter, mult, counter
                 ))
@@ -4452,7 +4461,8 @@ class SequenceNode(ExprNode):
             code.put_giveref(arg.py_result())
         if mult:
             code.putln('}')
-            code.funcstate.release_temp(counter)
+            #code.funcstate.release_temp(counter)
+            code.putln('}')
 
     def generate_subexpr_disposal_code(self, code):
         if self.mult_factor:

tests/run/consts.pyx

@@ -167,6 +167,14 @@ def multiplied_lists_with_side_effects():
     """
     return [side_effect(1), side_effect(2), side_effect(3)] * 5
 
+@cython.test_fail_if_path_exists("//MulNode")
+def multiplied_const_tuple():
+    """
+    >>> multiplied_const_tuple() == (1,2) * 5
+    True
+    """
+    return (1,2) * 5
+
 @cython.test_fail_if_path_exists("//PrimaryCmpNode")
 def compile_time_DEF():
     """