[llvm-bugs] [Bug 31166] New: std::inplace_merge seems to be unstable.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31166

            Bug ID: 31166
           Summary: std::inplace_merge seems to be unstable.
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: denis.yaroshevskij at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

Created attachment 17649
  --> https://llvm.org/bugs/attachment.cgi?id=17649&action=edit
Code that reproduces the bug.

The standard requires std::inplace_merge to be stable. If I am correct, it's
not in the version of the library that I'm using. In the attached example:
Expected output:
[{1,0}, {2,0}, {2,1}, {3,0}, {4,0}, ]
Real output:
[{1,0}, {2,1}, {2,0}, {3,0}, {4,0}, ]

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