Re: while(<>) in perl 5.22

> somewhere between perl 5.x and 5.22

Interesting. The diamond operator <> is documented to behave this way for x=0.4 (I wasn't able to find older references easily).

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
[download]

Comment on Re: while(<>) in perl 5.22 Select or Download Code

Replies are listed 'Best First'.
Re^2: while(<>) in perl 5.22 by BillKSmith (Monsignor) on Nov 14, 2016 at 23:04 UTC
Neither result is consistent with my understanding of the 5.22 documentation. `while (<>) { ... # code for each line } is equivalent to the following Perl-like pseudo code: unshift(@ARGV, '-') unless @ARGV; while ($ARGV = shift) { open(ARGV, $ARGV); while (<ARGV>) { ... # code for each line } }` [download] I would expect the open to fail silently.(There is no explicit test for errors.) The read on the unopened filehandle should return a false value. The loop would terminate without ever executing the print statement. Bill	[reply] [d/l]
Re^3: while(<>) in perl 5.22 by choroba (Cardinal) on Nov 14, 2016 at 23:25 UTC
The documentation also says there's a difference, and you can easily see there is: `~ $ perl -e '1 while <>' non-existent-file Can't open non-existent-file: No such file or directory at -e line 1.` [download] ($q=q:Sq=~/;[c](.)(.)/;chr(-\|\|-\|5+lengthSq)`"S\|oS2"`map{chr \|+ord }map{substrSq`S_+\|`\|}3E\|-\|`7**2-3:)=~y+S\|`+$1,++print+eval$q,q,a, [download]	[reply] [d/l] [select]


good chemistry is complicated, and a little bit messy -LW
	PerlMonks