Re^2: Implicit assignment to $

"This is a prime example of why I preach so heavily about use strict;. If you had invoked that pragma you'd have seen the warning:
"Use of uninitialized value $_ in print at sopw-simple.pl line 6."

Nuh-uh... strict does no such thing.

strict does three things:

Throws compile-time errors for undeclared variables.
Throws compile-time errors when barewords are seen which don't correspond to subs, and don't look like the package name in a class method call.
Throws run-time errors when symbolic references are used, or more generally when trying to dereference a variable which does not contain a reference.

strict never issues any warnings. And strict doesn't care about variables being undef (unless you try to dereference them).

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

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Re^3: Implicit assignment to $_ by blue_cowdawg (Monsignor) on Feb 26, 2013 at 18:40 UTC
Nuh-uh... strict does no such thing. Really? That's a copy/paste from my terminal. Wish there was a way to post screenshots to PM. Peter L. Berghold -- Unix Professional Peter -at- Berghold -dot- Net; AOL IM redcowdawg Yahoo IM: blue_cowdawg	[reply]
Re^4: Implicit assignment to $_ by tobyink (Canon) on Feb 26, 2013 at 20:21 UTC
You probably ran Perl with `-w` then, because it's warnings that produces that error. `package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name`	[reply] [d/l]
Re^5: Implicit assignment to $_ by hippo (Archbishop) on Feb 26, 2013 at 22:40 UTC
Confirmed (with 5.14.2): `$ cat test.pl use strict; "Test A"or"Test B"; print; $ perl test.pl $ perl -w test.pl Use of uninitialized value $_ in print at test.pl line 3.` [download]	[reply] [d/l]