[Issue 20740] New: `QualifierOf` can alias to `MutableOf` but `MutableOf` is `package` protected

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20740

          Issue ID: 20740
           Summary: `QualifierOf` can alias to `MutableOf` but `MutableOf`
                    is `package` protected
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: bootcamp
          Severity: trivial
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: b2.temp at gmx.com

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