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Not to interfer in class variables.
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testing
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You can use "measure" command to check performance in IRB like below:
irb(main):001:0> 3
=> 3
irb(main):002:0> measure
TIME is added.
=> nil
irb(main):003:0> 3
processing time: 0.000058s
=> 3
irb(main):004:0> measure :off
=> nil
irb(main):005:0> 3
=> 3
You can set "measure :on" by "IRB.conf[:MEASURE] = true" in .irbrc, and, also,
set custom performance check method:
IRB.conf[:MEASURE_PROC][:CUSTOM] = proc { |context, code, line_no, &block|
time = Time.now
result = block.()
now = Time.now
puts 'custom processing time: %fs' % (Time.now - time) if IRB.conf[:MEASURE]
result
}
https://github.com/ruby/irb/commit/3899eaf2e2
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IRB::ReadlineInputMethod#initialize changes them via IRB.set_encoding.
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It caches a path to .irbrc file, which has caused random failure:
```
1) Failure:
TestIRB::ExtendCommand#test_irb_info_multiline [/home/mame/work/ruby/test/irb/test_cmd.rb:49]:
Expected /
Ruby\sversion: .+\n
IRB\sversion:\sirb .+\n
InputMethod:\sReidlineInputMethod\swith\sReline .+ and .+\n
\.irbrc\spath: .+
/x to match "Ruby version: 2.8.0\n" +
"IRB version: irb 1.2.3 (2020-02-15)\n" +
"InputMethod: ReidlineInputMethod with Reline 0.1.4 and /tmp/test_reline_config_155659/.inputrc\n".
```
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IRB::ReadlineInputMethod#initialize sets via IRB.set_encoding.
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Readline::VERSION may not be a single word, e.g EditLine wrapper
when linked with editline.
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https://github.com/ruby/irb/commit/cdbb9dfc9f
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https://github.com/ruby/irb/commit/a6fe58e916
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