Perl: while with no conditional

Question

According to the doc, the while statement executes the block as long as the expression is true. I wonder why it becomes an infinite loop with an empty expression:

Answer 1

This is a special case. An empty condition expression defaults to just true, which means "loop forever, or until a break. In C (and perl) the idiom

for(;;) {
   // Neverending fun
}

has the same effect for the same reason.

There doesn't appear to be any mention of this in the official perl docs, and yet there is a special rule in the parser for it. Perhaps it's because nobody uses it :)

The for(;;) idiom is less uncommon though.