[Bug libstdc++/103853] std::forward_list::merge should check if __list != this

[pavel.kryukov at phystech dot edu via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103853

Pavel I. Kryukov <pavel.kryukov at phystech dot edu> changed:

           What    |Removed                     |Added
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  Attachment #52080|0                           |1
        is obsolete|                            |

--- Comment #7 from Pavel I. Kryukov <pavel.kryukov at phystech dot edu> ---
Created attachment 52133
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52133&action=edit
check if __list==this in std::forward_list::merge