https://issues.dlang.org/show_bug.cgi?id=13567

          Issue ID: 13567
           Summary: Attribute inference for private functions
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: DMD
          Assignee: nobody@puremagic.com
          Reporter: goxryz@gmail.com

Previously attribute inference was considered for all auto functions, but there was no consensus reached.

Using attribute inference for private functions avoids all previously raised concerns except "slows down compilation".

Walter:
"Please file as an enhancement request.

The more attribute inference we can do, the better."

--