Are there any "bad" Ada constructs?

[Gordon Dodrill <dodrill@swcp.com>]

The C and C++ language have several constructs that are undefined enough
that two conforming compilers are permitted to give different results and
still be correct.  One example is,

   i = 2;
   a[i] = i++;

Executing the second of these two statements, assuming they are properly 
declared first, a compiler is permitted to assign the value of 2 to either
a[2] or a[3] and be correct.  This construct is stated to be undefined by
the ANSI-C standard, and any compiler can actually do anything it pleases.
I saw one reference that stated there are 150 of these sorts of things in
C and C++.

My question is: Are there any constructs in Ada that are permitted to do
    two or more different things and still be correct, in a manner that
    is similar to that listed above?

Thanks,

Gordon

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