When did it get added to the language?
Pretty sure Perl 1 worked that way so, like, 1987? :)
edit: Yes, so saith the grammar in
perl.y from Perl-1.0
loop : label WHILE '(' texpr ')' compblock
{ $$ = wopt(add_label($1,
make_ccmd(C_WHILE,$4,$6) )); }
...
texpr : /* NULL means true */
{ scanstr("1"); $$ = yylval.arg; }
| expr
;
-- Randal L. Schwartz, Perl hacker
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.
