[Bug libstdc++/105502] [9/10/11/12/13 Regression] std::normal_distribution deserialization issue

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105502

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Or:

--- a/libstdc++-v3/include/bits/random.tcc
+++ b/libstdc++-v3/include/bits/random.tcc
@@ -1961,7 +1961,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       bool __saved_avail;
       if (__is >> __mean >> __stddev >> __saved_avail)
        {
-         if (__saved_avail && (__is >> __x._M_saved))
+         if (!__saved_avail || (__is >> __x._M_saved))
            {
              __x._M_saved_available = __saved_avail;
              __x.param(param_type(__mean, __stddev));