https://issues.dlang.org/show_bug.cgi?id=14592

          Issue ID: 14592
           Summary: [SPEC] Undocumented use of __U for mangling template
                    constraints
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: DMD
          Assignee: nob...@puremagic.com
          Reporter: ibuc...@gdcproject.org

I've never come across it, so maybe it's just dead code in DMD.

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