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    }
    elsif (!ref $_ [1] || "$_[1]" !~ /CODE\(0x[\da-f]+\)$/) {
        # Can't use C<ref $_[1] eq "CODE"> above as code references can be
        # blessed, and C<ref> would return the package the ref is blessed into.
        if (warnings::enabled) {
            $_ [1] = "undef" unless defined $_ [1];
            warnings::warn ("`$_[1]' is not a code reference");
        }
    }
    else {
        $^H{$_[0]} = $_[1];
        $^H |= $constants{$_[0]} | $overload::hint_bits;
    }
    shift, shift;
  }
}

sub remove_constant {
  # Arguments: what, sub
  while (@_) {
    delete $^H{$_[0]};
    $^H &= ~ $constants{$_[0]};
    shift, shift;
  }
}

1;

__END__

=head1 NAME