Error 51                   Invalid Subrange Type                     pp 322

 Source:  Compiler

 Cause:   Syntax error or invalid type.
          Valid subrange types are all scalar types except Real.

 Remedy:  Examine the subrange declaration for a missing dot, or
          a range of type Real.


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 Example:
       TYPE
          Days = Array [1.7]  of String [10];   { Wrong }
          Days = Array [1..7] of String [10];   { Correct }