Issue #17680 has been reported by simondedeo (Simon DeDeo).

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Bug #17680: tab completion no longer works on irb3.0
https://bugs.ruby-lang.org/issues/17680

* Author: simondedeo (Simon DeDeo)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin16]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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in irb2.5:

rb(main):001:0> source 'li [then I hit tab...]
linking.rb        list_load.rb      list_load_OLD.rb  
irb(main):001:0> source 'lis [then I hit tab again...]
list_load.rb      list_load_OLD.rb  
irb(main):001:0> source 'list_load.rb' [then I hit tab again...]

in irb3.0, hitting tab after typing "source 'li" gives.

irb(main):001:0' source 'li'

Here are my version numbers:

ayerie:simon$ irb3.0 -v
irb 1.3.0 (2020-12-25)
ayerie:CHLOE simon$ ruby3.0 -v
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin16]
ayerie:simon$ 





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