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Re^2: Announcing Perl 7

by hippo (Bishop)
on Jun 25, 2020 at 12:35 UTC ( [id://11118526]=note: print w/replies, xml ) Need Help??


in reply to Re: Announcing Perl 7
in thread Announcing Perl 7

... it would also remove the need to specify a perl version in order to use non-experimental, permanent features that that particular version brings. For example, need to add use v5.10; to use //= with perl 5.10.

Perhaps I've misunderstood you but I don't think that would be a change. I can quite happily use defined-or-equals without such a declaration in 5.10 (admittedly 5.10.1 which is the nearest version to which I have access - is it different for 5.10.0?).

$ perl -v | head -3

This is perl, v5.10.1 (*) built for x86_64-linux-thread-multi

$ perl -e '$z //= 20; print "$z\n";'
20
$

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Re^3: Announcing Perl 7
by parv (Parson) on Jun 25, 2020 at 13:26 UTC

    Thanks much, hippo, for correcting me. I might have mixed my memory of use 'v5.10' so that program would not compile with perl 5.8 when using "//=".

    Would a better example be of say where in perl 5.32 still need to enable it via feature or v5.10?

[reply]
[d/l]
[select]
      Yes, there are two kinds of features, those using the feature pragma and those not using it. See my Syntax::Construct which tries to address it (and will be obsoleted by Perl 7, yay!)

      map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
[reply]
[d/l]

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