Infiltrator REPL hangs on v1.12

[aviatesk]

It seems like the show mechanism, which is automatically hooked into the Infiltrator REPL, isn't working correctly. The Infiltrator REPL starts up fine, but when I send code to it, the REPL freezes.
I tested it without loading a startup file, using these steps:

   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _  |  |
  | | |_| | | | (_| |  |  Version 1.12.0-beta1 (2025-04-02)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org release
|__/                   |

julia> using Infiltrator

julia> using Example

(Example) julia> """
                     domath(x::Number)

                 Return `x + 5`.
                 """
                 function domath(x::Number)
                     # Main.@infiltrate
                     x + 5
                 end
domath

(Example) julia> """
                     domath(x::Number)

                 Return `x + 5`.
                 """
                 function domath(x::Number)
                     Main.@infiltrate
                     x + 5
                 end
[ Warning: @infiltrate is defined in Infiltrator and is not public in Main
domath

julia> domath(42)
Infiltrating domath(x::Int64)
  at REPL[8]:7


infil> x # hangs
^CERROR: InterruptException:
Stacktrace:
  [1] poptask(W::Base.IntrusiveLinkedListSynchronized{Task})
    @ Base ./task.jl:1187
  [2] wait()
    @ Base ./task.jl:1199
  [3] wait(c::Base.GenericCondition{ReentrantLock}; first::Bool)
    @ Base ./condition.jl:141
  [4] wait
    @ ./condition.jl:136 [inlined]
  [5] take_buffered(c::Channel{Any})
    @ Base ./channels.jl:532
  [6] take!
    @ ./channels.jl:526 [inlined]
  [7] eval_with_backend
    @ /Applications/Julia-1.12.app/Contents/Resources/julia/share/julia/stdlib/v1.12/REPL/src/REPL.jl:1157 [inlined]
  [8] print_response(errio::IO, response::Any, backend::Union{Nothing, REPL.REPLBackendRef}, show_value::Bool, have_color::Bool, specialdisplay::Union{Nothing, AbstractDisplay})
    @ REPL /Applications/Julia-1.12.app/Contents/Resources/julia/share/julia/stdlib/v1.12/REPL/src/REPL.jl:587
  [9] (::REPL.var"#print_response##0#print_response##1"{REPL.LineEditREPL, Tuple{Int64, Bool}, Bool, Bool})(io::Any)
    @ REPL /Applications/Julia-1.12.app/Contents/Resources/julia/share/julia/stdlib/v1.12/REPL/src/REPL.jl:556
 [10] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL /Applications/Julia-1.12.app/Contents/Resources/julia/share/julia/stdlib/v1.12/REPL/src/REPL.jl:829
 [11] print_response
    @ /Applications/Julia-1.12.app/Contents/Resources/julia/share/julia/stdlib/v1.12/REPL/src/REPL.jl:554 [inlined]
 [12] (::Infiltrator.var"#26#27"{Bool, String, Int64, Dict{…}, Vector{…}, REPL.LineEditREPL, Nothing, Nothing, Module, Base.TTY})(s::REPL.LineEdit.MIState, buf::IOBuffer, ok::Bool)
    @ Infiltrator ~/julia/packages/Infiltrator/src/Infiltrator.jl:742
 [13] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit /Applications/Julia-1.12.app/Contents/Resources/julia/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2852
 [14] run_interface
    @ /Applications/Julia-1.12.app/Contents/Resources/julia/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2846 [inlined]
 [15] debugprompt(mod::Module, locals::Dict{…}, trace::Vector{…}, terminal::REPL.Terminals.TTYTerminal, repl::REPL.LineEditREPL, ex::Nothing, bt::Nothing; nostack::Bool, file::String, fileline::Int64)
    @ Infiltrator ~/julia/packages/Infiltrator/src/Infiltrator.jl:763
 [16] start_prompt(mod::Module, locals::Dict{Symbol, Any}, file::String, fileline::Int64, ex::Nothing, bt::Nothing; terminal::Nothing, repl::Nothing, nostack::Bool)
    @ Infiltrator ~/julia/packages/Infiltrator/src/Infiltrator.jl:421
 [17] start_prompt(mod::Module, locals::Dict{Symbol, Any}, file::String, fileline::Int64, ex::Nothing, bt::Nothing)
    @ Infiltrator ~/julia/packages/Infiltrator/src/Infiltrator.jl:321
 [18] start_prompt
    @ ~/julia/packages/Infiltrator/src/Infiltrator.jl:321 [inlined]
 [19] macro expansion
    @ ~/julia/packages/Infiltrator/src/Infiltrator.jl:76 [inlined]
 [20] domath(x::Int64)
    @ Example ./REPL[8]:7
Some type information was truncated. Use `show(err)` to see complete types.

I confirmed that display(x) works fine instead of infil> x.

[pfitzseb]

This is a deadlock caused by JuliaLang/julia#57773. Infiltrator does Weird Things to the REPL, so it's not particularly unexpected.

[aviatesk]

Thanks so much for fixing this so quickly!