[Bug libstdc++/95209] New: std::filesystem::path::lexically_normal mangles "//foo"

[terra at gnome dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95209

            Bug ID: 95209
           Summary: std::filesystem::path::lexically_normal mangles
                    "//foo"
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: terra at gnome dot org
  Target Milestone: ---

Created attachment 48566
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48566&action=edit
test program

lexically_normal transforms "//foo" into "/foo".  It should leave
two initial slashes (an alternate root) alone.

Output of upcoming program is "/foo" when it should be "//foo".