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

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

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());

Let's observe:

>perl a.pl 1 >perl a.pl 1 >perl a.pl 0 >perl a.pl 1

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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