Please forgive my ignorance, but what's wrong with it? $foo ends up as 1 when $bar is true and is undefined when $bar is false. Just as I expect it to be. (Active Perl 5.8.7)
my $t_bar = 1;
my $t_foo = 1 if $t_bar;
my $f_bar = 0;
my $f_foo = 1 if $f_bar;
print "true $t_foo false $f_foo";
#->true 1 false
#->Use of uninitialized value in concatenation (.) or string ...
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