https://issues.dlang.org/show_bug.cgi?id=18170

          Issue ID: 18170
           Summary: std.functional.memoize should be usable in @safe
           Product: D
           Version: D2
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: greensunny12@gmail.com

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