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Bug #7964

Updated by nobu (Nobuyoshi Nakada) over 6 years ago

=begin
In the following script, an ASCII-8BIT String is written to a StringIO created with a UTF-8 String without error. However, a << b or a + b will raise an exception, as will writing an ASCII-8BIT String to a File with UTF-8 external encoding.

+ $ cat file_enc.rb

# encoding: utf-8

require 'stringio'



a = "On a very cold morning, it was -8°F."

b = a.dup.force_encoding "ascii-8bit"



io = StringIO.new a

io.write(b)

p io.string.encoding



File.open "data.txt", "w:utf-8" do |f|

f.write a

f.write b

end

+ $ ruby2.0 -v file_enc.rb

ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-darwin10.8.0]

#<Encoding:UTF-8>

file_enc.rb:13:in `write': "\xC2" from ASCII-8BIT to UTF-8 (Encoding::UndefinedConversionError)

from file_enc.rb:13:in `block in <main>'

from file_enc.rb:11:in `open'

from file_enc.rb:11:in `<main>'

+ $ ruby1.9.3 -v file_enc.rb

ruby 1.9.3p327 (2012-11-10 revision 37606) [x86_64-darwin10.8.0]

#<Encoding:UTF-8>

file_enc.rb:13:in `write': "\xC2" from ASCII-8BIT to UTF-8 (Encoding::UndefinedConversionError)

from file_enc.rb:13:in `block in <main>'

from file_enc.rb:11:in `open'

from file_enc.rb:11:in `<main>'
=end

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