Let's find a program where the prototype is non-deterministic and affects context. 

BEGIN {
    *call_to_inspect = ( rand() < 0.5
        ? sub ($) {}
        : sub (@) {}
    );
}

[download]

You can detect some changes in the compile-time state of a prototype by its effect on context. 

BEGIN {
    *call_to_query = ( rand() < 0.5
        ? sub ($) {}
        : sub (@) {}
    );
}

sub inspector { print wantarray ? 1 : 0, "\n" }
call_to_inspect(inspector());

[download]

Let's observe: 

>perl a.pl
1

>perl a.pl
1

>perl a.pl
0

>perl a.pl
1

[download]

Therefore, there exists a function call in a program for which two instance of the Perl parser have different prototypes for the named function.

Therefore, there exists a program for which two instance of the Perl parser produce different output.

Or for short, Perl cannot be parsed.

In reply to Re^3: Perl is not Dynamically Parseable by ikegami
in thread Perl is not Dynamically Parseable by Jeffrey Kegler

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