Re^2: Case where '( shift @_ )[ 0, 0 ]' returns only one value?

in reply to Re: Case where '( shift @_ )[ 0, 0 ]' returns only one value?
in thread Case where '( shift @_ )[ 0, 0 ]' returns only one value?

Looks like some kind of change somewhere between 5.18.4 and 5.20.3:

[~]$ perlbrew exec perl -le '@_ = qw( a b c ); @A = ( shift @_ )[ 0, 0
+ ]; print @A'
[...]
perl-5.22.2
==========
aa


perl-5.20.3
==========
aa


perl-5.18.4
==========
a


perl-5.16.3
==========
a


perl-5.14.4
==========
a
[download]

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Re^3: Case where '( shift @_ )[ 0, 0 ]' returns only one value? by stevieb (Canon) on Jan 14, 2019 at 21:52 UTC
I confirm these findings (on Perl running on Windows at least). `> berrybrew exec perl -le "@_ = qw( a b c ); @A = ( shift @_ )[ 0, 0 ] +; print @A" perl-5.28.1_64 ============== aa perl-5.20.3_64 ============== aa perl-5.18.4_64 ============== a` [download]	[reply] [d/l]
Re^4: Case where '( shift @_ )[ 0, 0 ]' returns only one value? by stevieb (Canon) on Jan 14, 2019 at 22:41 UTC
I was going to just edit my post after I got my `perlbrew available` issue sorted (which I did), but this warrants a new post. In 5.10, it produces the result `aa` that is expected by OP: `spek@scelia ~/scratch $ perlbrew exec perl -le '@_ = qw( a b c ); @A = + ( shift @_ )[ 0, 0 ]; print @A' perl-5.27.10 ========== aa perl-5.26.1 ========== aa perl-5.20.0 ========== aa perl-5.18.4 ========== a perl-5.10.1 ========== aa` [download] Going full out, and am installing as many versions as I can to see where it "broke", where it "fixed" and where it "broke" again. Help desired. Update: To further, on Unix, it "works" up to 5.12.5, from my testing so far, then goes awry: `spek@scelia ~/scratch $ perlbrew exec perl -le '@_ = qw( a b c ); @A = + ( shift @_ )[ 0, 0 ]; print @A' perl-5.27.10 ========== aa perl-5.26.1 ========== aa perl-5.20.0 ========== aa perl-5.18.4 ========== a perl-5.16.0 ========== a perl-5.14.4 ========== a perl-5.12.5 ========== aa perl-5.10.1 ========== aa` [download]	[reply] [d/l] [select]

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