XP is just a number PerlMonks

by xmath (Hermit)
 on Oct 28, 2003 at 18:27 UTC ( #302748=note: print w/ replies, xml ) Need Help??

ok, here's why:

 initially at parse time a goto-expression is free of special cases, so goto &foo is just a goto-element with the ENTERSUB expression &foo as argument. Now, the "goto SUB" variation needs a subref ofcourse, and to accomplish this perl effectively puts a \ in front of the argument, turning goto &foo into goto \&foo. Now here comes the problem: it does this whenever the argument is an ENTERSUB, and forgets to check for the ampersand (!(o->op_flags & OPf_STACKED)), so goto +foo becomes goto \foo, which results in the strange error message (the +-prefix is already dropped at parse time, and is just to prevent the special-case handling for goto LABEL to be triggered)

Questions? :-)

Comment on Re[6]: How's your Perl?

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