I'm more than happy with renaming the problem to "goto creates spurious scopes".
goto doesn't create any scopes. As I've already stated, the memory is being used when my is executed since that causes it push an instruction on the stack.
Ok, but again we could argue over the definition of the word "needed". "Needed" by the program writer or "needed" by an implementation that keeps scopes around that are not accessible to the program writer anymore?
The instruction is needed because it's virtually impossible to tell that the scope will never exit.
- A lot of things can throw exceptions.
- Including signal handlers.
- The program can change while it's running.
Even in the simplest cases, it would be extremely expensive to check, especially since this check would have to be performed at run-time.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||