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$/ = undef;
my $string = <$filehandle>;

my $old_terminator = $/;
$/ = undef;
my $string = <$filehandle>;
$/ = $old_terminator;

my $string;
{
  local $/ = undef;
  $string = <$filehandle>;
}

my $string;
{
  local $/;
  $string = <$filehandle>;
}

my $string = do {
  local $/;
  <$filehandle>;
}

local $/ = <$filehandle>