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Limit implicit show in REPL to printing 20 KiB by default #53959

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ericphanson
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closes #40735

@KristofferC
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Do you have an example of how this looks in practice?

@ericphanson
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ericphanson commented Apr 5, 2024

Yeah, here is the example from the tests.

julia> using REPL

julia> REPL.SHOW_MAXIMUM_BYTES = 1000
1000

julia> struct A40735
           str::String
       end

julia> str = string(('a':'z')...)^40
"abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijk"  499 bytes  "qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"

julia> A40735(str)
A40735("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdeError showing value of type A40735:
ERROR: REPL.LimitIOException: aborted printing after attempting to `show` more than 1000 bytes of data in the REPL.
Stacktrace:
  [1] write
    @ ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:385 [inlined]
  [2] write
    @ ./io.jl:450 [inlined]
  [3] write
    @ ./io.jl:869 [inlined]
  [4] print
    @ ./char.jl:252 [inlined]
  [5] escape_string(io::IOContext{REPL.LimitIO{IOContext{Base.TTY}}}, s::String, esc::Tuple{Char, Char}; keep::Tuple{})
    @ Base ./strings/io.jl:424
  [6] escape_string
    @ ./strings/io.jl:416 [inlined]
  [7] print_quoted
    @ ./strings/io.jl:450 [inlined]
  [8] show(io::IOContext{REPL.LimitIO{IOContext{Base.TTY}}}, s::String)
    @ Base ./strings/io.jl:197
  [9] _show_default(io::IOContext{REPL.LimitIO{IOContext{Base.TTY}}}, x::Any)
    @ Base ./show.jl:496
 [10] show_default
    @ ./show.jl:479 [inlined]
 [11] show
    @ ./show.jl:474 [inlined]
 [12] show(io::IOContext{REPL.LimitIO{IOContext{Base.TTY}}}, ::MIME{Symbol("text/plain")}, x::A40735)
    @ Base.Multimedia ./multimedia.jl:47
 [13] (::REPL.var"#68#69"{REPL.REPLDisplay{LineEditREPL}, MIME{Symbol("text/plain")}, Base.RefValue{Any}})(io::Any)
    @ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:413
 [14] with_repl_linfo(f::Any, repl::LineEditREPL)
    @ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:709
 [15] display(d::REPL.REPLDisplay, mime::MIME{Symbol("text/plain")}, x::Any)
    @ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:395
 [16] display
    @ ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:418 [inlined]
 [17] display(x::Any)
    @ Base.Multimedia ./multimedia.jl:340
 [18] #invokelatest#2
    @ ./essentials.jl:1030 [inlined]
 [19] invokelatest
    @ ./essentials.jl:1027 [inlined]
 [20] print_response(errio::IO, response::Any, show_value::Bool, have_color::Bool, specialdisplay::Union{…})
    @ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:455
 [21] (::REPL.var"#70#71"{LineEditREPL, Pair{Any, Bool}, Bool, Bool})(io::Any)
    @ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:424
 [22] with_repl_linfo(f::Any, repl::LineEditREPL)
    @ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:709
 [23] print_response(repl::AbstractREPL, response::Any, show_value::Bool, have_color::Bool)
    @ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:422
 [24] (::REPL.var"#do_respond#93"{})(s::REPL.LineEdit.MIState, buf::Any, ok::Bool)
    @ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:1051
 [25] #invokelatest#2
    @ ./essentials.jl:1030 [inlined]
 [26] invokelatest
    @ ./essentials.jl:1027 [inlined]
 [27] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2747
 [28] run_frontend(repl::LineEditREPL, backend::REPL.REPLBackendRef)
    @ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:1476
 [29] (::REPL.var"#75#81"{LineEditREPL, REPL.REPLBackendRef})()
    @ REPL ~/julia-native/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:526
Some type information was truncated. Use `show(err)` to see complete types.

BTW, as discussed in the issue, this is a kind of last-resort fallback. The "correct" answer is for objects to implement reasonable show methods. In practice, this isn't always the case, and overly long objects can hang or crash Julia (as discussed in the issue), and therefore I think some kind of fallback is important. (Long printing usually just hangs Julia, but then when you ctrl-c to try to recover control, half the time it will crash to shell). Note that with the limit set at 100k bytes, only extremely long outputs will ever trigger this.

@ericphanson
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BTW, at the very end of the printing, there's

[...]tuvwxyzabcdeError showing value of type A40735:
ERROR: REPL.LimitIOException: aborted printing after attempting to `show` more than 1000 bytes of data in the REPL.

I wonder if I should write a \n before throwing the error? That way it would look like

[...]tuvwxyzabcde
Error showing value of type A40735:
ERROR: REPL.LimitIOException: aborted printing after attempting to `show` more than 1000 bytes of data in the REPL.

@KristofferC
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Throwing from the REPL with a big stacktrace into the guts of it doesn't seem very useful to the user.

@ericphanson
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What would you suggest?

@KristofferC
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Stop printing and then print something in the end about printing being stopped, or?

@ericphanson
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That sounds like a better idea. I just pushed a commit, with that I get

julia> A40735(str)
A40735("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcde…[printing stopped after 1000 displaying bytes]

(ends with …[printing stopped after 1000 displaying bytes]).

I did not change the default from 100k bytes, but since this is less disruptive we could probably bring it down.

@ericphanson
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bump

@KristofferC
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Any opinion about printing the end of the message in yellow, similar to how it is done in

image

just to make it easier for the user to see that the printing was in fact aborted?

@ericphanson
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ericphanson commented Apr 26, 2024

I added the colored printing, but the performance issue may be a showstopper here.
Screenshot 2024-06-12 at 00 15 42

@ericphanson
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I just pushed a commit to lower the limit to 20KiB, since that seemed high enough to not be hit too often by accident, but low enough to be more useful:

julia> A40735(str^100)
A40735("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz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stopped after displaying 20.000 KiB]

That's about 9 screens of wrapped text in 23-line-tall, 103-column wide vscode editor window on my laptop

@ericphanson ericphanson changed the title Limit printing in the REPL to 100k bytes Limit printing in the REPL to 20 KiB Jun 12, 2024
@ericphanson
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it looks like this picked up a conflict with #54446; I resolved it by passing show_repl within show_limited

@KristofferC
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This seems fine to me now but I haven't tested the performance etc myself.

@ericphanson
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If it is low risk we could try it out on master to see if folks run into issues

@lgoettgens
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I really like the idea of this PR and would support merging it into master for people to try out. If there are too many issues, we can easily revert it, since we are so early in the 1.12 release cycle right now.

@thofma
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thofma commented Aug 19, 2024

What is the mechanism to get the full output? I think there should be one similar to err.

@lgoettgens
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What is the mechanism to get the full output? I think there should be one similar to err.

From what's contained in the news entry its just show(stdout, MIME"text/plain"(), ans), as this only affects the implicit show by the REPL (iirc).

stdlib/REPL/src/REPL.jl Outdated Show resolved Hide resolved
@ericphanson
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show(stdout, MIME"text/plain"(), ans)

Should this go in the message? I guess it could say

"…[printing stopped after displaying $(Base.format_bytes(e.maxbytes)); call `show(stdout, MIME"text/plain"(), ans)` to print without truncation]"

though it's a bit verbose.

It's also technically slightly different from the full implicit show since the implicit show depends on the REPL's iocontext (which sets limit => true, the active module, and possibly other things?), whereas show to stdout does not have any special IO properties set. Another option would be to tell them to do import REPL; REPL.SHOW_MAXIMUM_BYTES = 2^30; ans to show ans again with effectively unlimited printing.

@thofma
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thofma commented Aug 21, 2024

Should this go in the message? I guess it could say

"…[printing stopped after displaying $(Base.format_bytes(e.maxbytes)); call `show(stdout, MIME"text/plain"(), ans)` to print without truncation]"

though it's a bit verbose.

It's also technically slightly different from the full implicit show since the implicit show depends on the REPL's iocontext (which sets limit => true, the active module, and possibly other things?), whereas show to stdout does not have any special IO properties set. Another option would be to tell them to do import REPL; REPL.SHOW_MAXIMUM_BYTES = 2^30; ans to show ans again with effectively unlimited printing.

Printing a hint is great! I have no suggestion on which option to prefer, but I would not mind it being too verbose.

@ericphanson
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ok, I've added such a hint:
Screenshot 2024-08-21 at 23 44 42

@ericphanson
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test failures seem unrelated

🚨 Error: Failed to remove "/Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-HL2F7YQ3XH.0/build/default-honeycrisp-HL2F7YQ3XH-0/julialang/julia-master" (fstatat /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-HL2F7YQ3XH.0/build/default-honeycrisp-HL2F7YQ3XH-0/julialang/julia-master/julia-085cc34275/share/julia/test/project/Extensions/HasDepWithExtensions.jl/Manifest.toml: permission denied)
 

Screenshot 2024-08-22 at 12 37 54

@ericphanson
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Bump

@ericphanson ericphanson changed the title Limit printing in the REPL to 20 KiB Limit implicit show in REPL to 20 KiB Sep 12, 2024
@ericphanson ericphanson changed the title Limit implicit show in REPL to 20 KiB Limit implicit show in REPL to printing 20 KiB by default Sep 12, 2024
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REPL shouldn't auto-show giant outputs
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