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my $data = do { open my $fh, '<', $file or die "$file: $!";
    local $/; <$fh> };

my $data = do { open my $fh, '<:raw:encoding(UTF-8)', $file
    or die "$file: $!"; local $/; <$fh> };

my $data; { open my $fh, '<', $file or die "$file: $!";
    local $/; $data = <$fh> };

my $data = do { local (*ARGV,$/); @ARGV=$file; <> };