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Postings from April 2000
The opcodes that Perl compiles your program into ARE NOT THE ONES
THAT YOU SAW.
There are a million cases of this. Here are two:
% perl -MO=Deparse -e 'for($i=0; $i<10; $i++){}'
$i = 0;
while ($i < 10) {
();
}
continue {
++$i
}
Look, there's NO for loop there anymore! My goodness, what a
terrible bug! What are you going to do now, change that too?
Also, the postinc you wrote is NOT what Perl is going to execute.
It's a different opcode. There are *plenty* of other cases like
this. It's what the compiler is doing. Here's another:
% perl -MO=Deparse -ne '$seen{$_}++ && print'
LINE: while (defined($_ = <ARGV>)) {
print $_ if $seen{$_}++;
}
I NEVER SAID if. But look at that! And where did that LINE label
come from? I never said that either. Dang it, perl is broken.
What do you propose to do about these terrible errors, huh?
--tom
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