Same way this is...

use strict 'refs';
${      hello_world } = "hello world";
${ $_ = hello_world } = "hello world";

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They're both basically the same construct, but the syntax on line #2 is a symbolic reference that use strict 'refs' treats as an exception, and allows. The "Not-so-symbolic references" section in perlref documents this.

What it shows I suppose is that the line between symbolic references and hard references is slightly fuzzy.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In reply to Re^3: Curly braces variable by tobyink
in thread Curly braces variable by Anonymous Monk

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