Do you know why a specific behavior is not defined?
I think that there's no one consistent way to define one. Usually variables are block scoped, so making my $x for @list behaving the same as do { my $x } for @list is just weird.

One could argue that $stuff for @list should always be the same as for @list { $stuff }, but then you could write 

use strict;
print $x*$x for my $x (0..10);

[download]

Which seems equally weird, because a variable is used (textually)before it is declared. (And I don't know if that's technically possible in the perl compiler).

So regardless from which angle you look at it, it smells badly. So the behaviour is not defined. Maybe someday a hero of programming languages will find something that's consistent in every way, and then it can be still implemented.

In reply to Re^3: Lexical scope vs. postfix loops (perl bug?) by moritz
in thread Lexical scope vs. postfix loops (perl bug?) by jh

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