Formatting of generic discrete type disagrees with GNAT warning

Noticed in this code snippet, autoformat in VS Code (with GNATformat) results in this:

generic
   type My_Enum is(<>);
package Example is
   My_Values : array (My_Enum) of Boolean;
end Example;

GNATformat removed the space between is and (<>) and building with GNAT then gives a (style) space required warning between is and (<>).

This is also duplicated when running GNATformat directly, like with gnatformat --project my_example.

Reproduce the formatting discrepancy with the generic Ada snippet in the issue, both through VS Code with GNATformat and with gnatformat --project my_example. Trace the formatter’s handling of is (<>);; done means the space is preserved and GNAT no longer reports the (style) space required warning.