Rationale for Ada 2012

John Barnes
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9.3.4 Defaults for generic parameters

Generic subprogram parameters and object parameters of mode in can have defaults. But other parameters such as packages and types cannot. This was considered irksome and untidy and efforts were made to define a suitable notation for all possible generic parameters.
However, it was abandoned partly because an appropriate syntax seemed hard to find and more importantly, it was not felt to be that important. Again, it was not deemed important enough to be reconsidered for Ada 2012.

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