Bug #13051: Object created with ARGF.class.new fails to update .lineno in .each

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.4.0rc1 (2016-12-12 trunk 57064) [i686-linux]
• Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN

[lucasbuchala (Lucas Buchala)]

I don't know if this way of creating ARGF-like objects is supported or not.
I just noticed that it didn't update the .lineno when used in .each.

Consider the example input file:

$ cat file1
foo
bar
baz

The following code:

f = ARGF.class.new('file1')

f.each do |line|
  puts "#{f.lineno} #{line}"
end

Outputs this:

0 foo
0 bar
0 baz

I was expecting this:

1 foo
2 bar
3 baz

If, instead of using .each, I read it in 2 steps with: while line = f.gets; puts f.lineno; ..., then it works, the line numbers are updated.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset r57124.

---

io.c: update argf lineno

• io.c (argf_block_call_line): update line number in non-global
  ARGF instance. [ruby-core:78728] [Bug #13051]