IRB hanging on /\u{ input

[kddnewton]

Description

What are your expected behavior and actual behavior of your environment?

Not sure why, but when you enter an IRB session and type the literal characters: /, \, u, { it hangs indefinitely and the process must be killed.

Result of irb_info

Please paste the result of irb_info command in IRB.

irb(main):001:0> irb_info
=>
Ruby version: 3.2.0
IRB version: irb 1.8.1 (2023-09-04)
InputMethod: RelineInputMethod with Reline 0.3.8
RUBY_PLATFORM: arm64-darwin22
LANG env: en_US.UTF-8
East Asian Ambiguous Width: 1

Terminal Emulator

What's your terminal emulator?

MacOS terminal with zsh

Setting Files

Are you using ~/.irbrc and ~/.inputrc?

No

[tompng]

#620
It's ruby's bug and fixed in 3.3.0dev https://bugs.ruby-lang.org/issues/19750

All of these hangs up, and it's hard to avoid in IRB side.

RubyVM::AbstractSyntaxTree.parse "/\\u{\n" # not used in IRB
RubyVM::InstructionSequence.compile "/\\u{\n" # code termination check
Ripper.lex "/\\u{\n" # coloring, indent calculation, prompt calculation
Ripper.sexp "/\\u{\n" # command execution, assignment expression check

[kddnewton]

Oh sorry I didn't find that it had been reported before. No worries.