String#split wrong behavior and return value

[dustalov]

It seems that String#split method corrupts the encodings of generated strings and returns TrueClass instead of Array.

>> RUBY_DESCRIPTION
=> "rubinius 2.0.0.rc1 (1.9.3 dec3ff31 yyyy-mm-dd JI) [x86_64-unknown-linux-gnu]"

>> s = 'а б в'
=> "а б в"
>> s.encoding
=> #<Encoding:UTF-8>
>> a, b, c = s.split
=> true

>> a
=> "\xD0\xB0"
>> a.encoding
=> #<Encoding:ASCII-8BIT>
>> b
=> "\xD0\xB1"
>> b.encoding
=> #<Encoding:ASCII-8BIT>
>> c
=> "\xD0\xB2"
>> c.encoding
=> #<Encoding:ASCII-8BIT>

[dustalov]

>> RUBY_DESCRIPTION
=> "ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]"

>> s = 'а б в'
=> "а б в"
>> s.encoding
=> #<Encoding:UTF-8>
>> a, b, c = s.split
=> ["а", "б", "в"]

>> a
=> "а"
>> a.encoding
=> #<Encoding:UTF-8>
>> b
=> "б"
>> b.encoding
=> #<Encoding:UTF-8>
>> c
=> "в"
>> c.encoding
=> #<Encoding:UTF-8>

[leocassarani]

There are two unrelated issues here:

• Destructuring assignments return true instead of the thing being destructured. This is not a problem that's specific to String#split.
• String#split is lossy with regards to the original encoding of the string.

[dbussink]

@leocassarani If we fix String#split, we can close this issue, since the remaining part is a duplicate of #1765

[dustalov]

Yep. This issue mainly covers an encoding bug, not a multiple assignment problem.