I think this is what you wanted :
#!/usr/bin/perl
use strict;
use warnings;
sub foo
{
my %params = @_;
print "$_: $params{$_}\n", for keys %params;
}
my $word = shift @ARGV || "world";
foo ( hello => $word );
Do not use $_ as a temporary variable unless essential.
Declaring and naming the variable catches a lot of issues and solves (for example) the problem you came across as well as improving readability.
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