Why what? Why create an alias? 
sub inplace_uc {
   our $text; local *text = \$_[0];
   $text =~ tr/a-z/A-Z/;
}

[download]

Update: Added missing "$text =~".

In reply to Re^2: Tell me how it works! by ikegami
in thread Tell me how it works! by nagalenoj

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