[in Windows 10, running official v3.8.0 beta 1, Lenovo desktop machine, Core i7]

These first 3 lines run OK...

#version max (3.5, min (3.8, version));
global_settings { assumed_gamma 1 }
#declare Int = interior { ior 1.5 }

Adding the 4th line...
      #declare myInt = Int
...causes a fatal error-- but the error message changes(!)

If I freshly start POV-ray, the error says
       "Parse error: vector <T> to long"  (whatever that means).

Immediately running the code again, it's
      "Parse error: bad allocation"

By changing the 4th line to
      #declare myInt = interior{Int}
it all runs fine, no error.

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