disable tuple(genexpr) as it has a non-obvious negative effect on memory usage...

disable tuple(genexpr) as it has a non-obvious negative effect on memory usage - better let users write tuple([...]) explicitly

Cython/Compiler/Optimize.py

@@ -1186,7 +1186,7 @@ class EarlyReplaceBuiltinCalls(Visitor.EnvTransform):
             gen_expr_node.pos, loop = exec_code, result_node = result_ref,
             expr_scope = gen_expr_node.expr_scope, orig_func = 'sum')
 
-    def _handle_simple_function_tuple(self, node, pos_args):
+    def _DISABLED_handle_simple_function_tuple(self, node, pos_args):
         if len(pos_args) == 0:
             return ExprNodes.TupleNode(node.pos, args=[], constant_result=())
         # This is a bit special - for iterables (including genexps),

tests/run/inlined_generator_expressions.pyx

 
 cimport cython
 
-def range_tuple_genexp(int N):
-    """
-    >>> range_tuple_genexp(5)
-    (0, 1, 2, 3, 4)
-    """
-    return tuple(i for i in range(N))
+## def range_tuple_genexp(int N):
+##     """
+##     >>> range_tuple_genexp(5)
+##     (0, 1, 2, 3, 4)
+##     """
+##     return tuple(i for i in range(N))
 
 
 @cython.test_assert_path_exists('//ForFromStatNode',