Re: Unusual compiler error: 'unable to obtain the MIN value for type the ZType'

[Alice Osako]

Benjamin Kowarsch:
> The root cause of the error is most likely the expression
>
> cp IN ASCIIRange
>
> because cp (of type CARDINAL) is probably incompatible with the 
> underlying type of ASCIIRange.
>
> Modula-2 follows name equivalence and unlike C it does not use type 
> promotion.
>
> You could try to define ASCIIRange explicitly as a subtype of CARDINAL.
>
> TYPE ASCIIRange = CARDINAL [32..127];
>
> Or simply test against the boundaries.
>
> CONST Min7BitPrinatble = 32; Max7BitPrintable = 127;
>
> IF (cp >= Min7BitPrintable) AND (cp <= Max7BitPrintable) THEN ... END;

Ah, that explains it. Specifying ASCIIRange as a subtype of CARDINAL 
solves this problem, as well as two similar issues I had overlooked 
until now. The code as it is now does compile, thank you.

I will try working on some simple tests for the UTF-32 representation 
next, before addressing the UTF-8 to UTF-32 translations.