tree f54cb6477ec1f9ec2c5bd513b635efbf1b795cec
parent 9a078a372ea69eb2d3f0700dfa14809648e78a88
author Peng Liu <winner245@hotmail.com> 1742401691 -0400
committer GitHub <noreply@github.com> 1742401691 -0400
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[libc++] Verify forward_list self-merging is a no-op (#129985)

https://wg21.link/LWG3088 requires that `forward_list::merge()` is a no-op when passed
`*this`, which aligns with the behavior of `list::merge`. Although libc++'s implementation
of `forward_list::merge()` already meets this requirement, there were no tests to verify
this behavior. This patch adds the necessary tests to ensure that self-merging remains a
no-op and prevents any future regressions on this.

Closes #104942.