[exim-dev] [Bug 1899] New: a macro definition method permitt…

https://bugs.exim.org/show_bug.cgi?id=1899

            Bug ID: 1899
           Summary: a macro definition method permitting optional redefine
           Product: Exim
           Version: 4.87
          Hardware: All
                OS: All
            Status: NEW
          Severity: wishlist
          Priority: medium
         Component: Unfiled
          Assignee: nigel@???
          Reporter: jgh146exb@???
                CC: exim-dev@???

Currently a single = macro definition requires no existing duplicate name, a
double '==' requires there be one to redefine. This is for a way that permits
but does not require an existing match, re/defining as appropriate.

To avoid removing existing functionality this should be new syntax.
Perhaps ':='.

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