[perl #130038] Builtin variable for loop index in foreach

Translating the loop at compile time into a new builtin foreach_idx sounds sensible, and it effectively automates what the programmer currently has do to in the code.  But if $# is a lexical scoped at compile time to the for loop, it won't be available in subroutines called from the loop.  This makes it inconsistent with next/last/redo, which do work from subroutines (matching the enclosing loop at run time).  Personally speaking I'd be fine with that (I consider always allowing 'next' from a subroutine something of a wart on the language) but I just mention the asymmetry.

One advantage of a new builtin loopidx rather than $# would be that you could specify loopidx(LABEL).  This might be another point in favour of a compile-time translation approach, that it could allow loopidx(LABEL) to be implemented more easily.

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via perlbug:  queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=130038

• [perl #130038] Builtin variable for loop index in foreach by Ed Avis
• Re: [perl #130038] Builtin variable for loop index in foreach by Dave Mitchell
• Re: [perl #130038] Builtin variable for loop index in foreach by Aristotle Pagaltzis
• Re: [perl #130038] Builtin variable for loop index in foreach by Kent Fredric
• Re: [perl #130038] Builtin variable for loop index in foreach by Dave Mitchell
• Re: [perl #130038] Builtin variable for loop index in foreach by Dave Mitchell
• Re: [perl #130038] Builtin variable for loop index in foreach by Kent Fredric
• Re: [perl #130038] Builtin variable for loop index in foreach by Kent Fredric
• [perl #130038] Builtin variable for loop index in foreach by Hugo van der Sanden via RT
• Re: [perl #130038] Builtin variable for loop index in foreach by Zefram
• Re: [perl #130038] Builtin variable for loop index in foreach by Dave Mitchell
• [perl #130038] Builtin variable for loop index in foreach by Ed Avis via RT
• RE: [perl #130038] Builtin variable for loop index in foreach by Ed Avis
• Re: [perl #130038] Builtin variable for loop index in foreach by demerphq
• Re: [perl #130038] Builtin variable for loop index in foreach by Dave Mitchell
• RE: [perl #130038] Builtin variable for loop index in foreach by Ed Avis