Issue #15910 has been updated by kou (Kouhei Sutou).

Status changed from Open to Rejected

CSV implementation was changed to improve performance. The new implementation reads data as chunk (`$stdin.gets(nil, 4096)`) instead of lines (`$stdin.gets`) from input. `$.` doesn't work with reading data as chunk.

It's backward incompatible but I don't want to keep the previous behavior. Because it blocks performance improvement.

You can use `CSV#lineno` as alternative:

```ruby
require 'csv'
IFS=';'
CSV_OPTIONS = { col_sep: IFS, external_encoding: Encoding::ISO_8859_1, internal_encoding: Encoding::UTF_8 }
csv = CSV.new($stdin, CSV_OPTIONS)
csv.each do |row|
  puts "::::line #{csv.lineno} row=#{row}"
end
```

`CSV#lineno` reports logical line number. If your CSV data has a record that includes new lines:

```csv
a;"with
new
line"
b;c
```

`CSV#lineno` reports `1` for `a;"with\nnew\nline"` row and `2` for `b;c` row.

If your CSV data doesn't have these rows, you can use `CSV#lineno` as alternative of `$.`.

----------------------------------------
Bug #15910: $. doesn't hold the linenumber anymore when reading a CSV-file using the CSV class
https://bugs.ruby-lang.org/issues/15910#change-78423

* Author: rovf (Ronald Fischer)
* Status: Rejected
* Priority: Normal
* Assignee: kou (Kouhei Sutou)
* Target version: 
* ruby -v: ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-cygwin]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Example program:

```
require 'csv'
IFS=';'
CSV_OPTIONS = { col_sep: IFS, external_encoding: Encoding::ISO_8859_1, internal_encoding: Encoding::UTF_8 }
CSV.new($stdin, CSV_OPTIONS).each do
    |row|
    puts "::::line #{$.} row=#{row}"
end%          
```

With this program, I could dump a semicolon-delimited CSV file, with line numbers. Now the line number always displays as 0. Has the implementation of CSV changed?

See also https://stackoverflow.com/questions/56524941/is-special-variable-gone-from-ruby



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