Re: [C++ Patch] PR 63265

[Jason Merrill]

On 11/11/2014 08:04 AM, Paolo Carlini wrote:
-       tree cond = RECUR (TREE_OPERAND (t, 0));
+       tree cond
+         = maybe_constant_value (fold_non_dependent_expr_sfinae
+                                 (RECUR (TREE_OPERAND (t, 0)), tf_none));

I like this approach, but if the result of maybe_constant_value doesn't 
turn out to be an INTEGER_CST, we want to end up with the result of 
RECUR rather than the result of fold_non_dependent_expr, as the latter 
might not be suitable for subsequent tsubsting.

Jason