Seems to me the issue is the way doublequotes are interpolated. So...
      mayybe simpler still, but -- admittedly -- not one line:

#!/usr/bin/perl -w
use 5.018;
use strict;
# 1150034

my %foo = ("do"=>  "done", "eggs"  =>"green ham", "was" => "were",);

my @v;
(@v = keys %foo) == 1 or warn "Got more than one: " . @v . "\n";
print "V:@v\n";

[download]

OUTPUT:

Got more than one: 3
V:was do eggs

[download]

Spirit of the Monastery

In reply to Re: Declaring with my, assigning, and testing in same line by ww
in thread Declaring with my, assigning, and testing in same line by mordibity

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