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Re: [PATCH @8404] Consolidated lvalue sub changes

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Tim Bunce
January 12, 2001 03:56
Re: [PATCH @8404] Consolidated lvalue sub changes
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On Wed, Jan 10, 2001 at 09:36:51PM -0800, Stephen McCamant wrote:
> --- perl-current/pod/perldiag.pod	Thu Dec 28 17:35:12 2000
> +++ perl+lval2/pod/perldiag.pod	Wed Jan 10 21:12:45 2001
> @@ -929,6 +929,14 @@
>  temporary or readonly values) from a subroutine used as an lvalue.  This
>  is not allowed.
> +=item Can't return %s to lvalue scalar context
> +
> +(F) You tried to return a complete array or hash from an lvalue subroutine,
> +but you called the subroutine in a way that made Perl think you meant
> +to return only one value. You probably meant to write parentheses around
> +the call to the subroutine, which tell Perl that the call should be in
> +list context.

	(sub_returning_lvalue_hash()) = 1;

would be rather odd and, I hope, generate an 'odd number of elements in
hash assignment' error.

	(sub_returning_lvalue_array()) = 1;

could perhaps be better written as
	sub_returning_lvalue_array() = (1);

(I'm not sure if that'll work as I'd expect, I've not been following
too closely.) So I'd suggest that the docs suggest writing parentheses
around the _value_ rather than the call.


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