Debugger crash while stepping over Zygote code

[mbauman]

Hard to get a MWE, but this happened while se'ing over some Flux/Zygote code:

1|debug> se
In Pullback(Δ) at /home/mbauman/.julia/packages/Zygote/1GXzF/src/compiler/interface2.jl:38
 1  1 ─       $(Expr(:meta, :inline))
 2  │   %2  = (getfield)(#self#, :t)
 3  │   %3  = (getindex)(%2, 3)
 4  │   %4  = (getindex)(%2, 2)
>5  │   %5  = (getindex)(%2, 1)
 6  │   %6  = (%3)(Δ)
 7  │   %7  = (Zygote.gradindex)(%6, 3)
 8  │   %8  = (Zygote.gradindex)(%6, 4)
 9  │   %9  = (%4)(%8)

About to run: <(getindex)((Zygote.var"#358#back#184"{Zygote.var"#back#183"{:loss,Zygote.Context,Flux.Optimise.var"#1...>
1|debug> se
ERROR: TypeError: in typeassert, expected Array{Any,1}, got Array{Core.LineInfoNode,1}
Stacktrace:
 [1] linetable at /home/mbauman/.julia/packages/JuliaInterpreter/27fDA/src/utils.jl:270 [inlined]
 [2] linetable at /home/mbauman/.julia/packages/JuliaInterpreter/27fDA/src/utils.jl:272 [inlined]
 [3] whereis(::JuliaInterpreter.FrameCode, ::Int64) at /home/mbauman/.julia/packages/JuliaInterpreter/27fDA/src/utils.jl:307
 [4] whereis at /home/mbauman/.julia/packages/JuliaInterpreter/27fDA/src/utils.jl:311 [inlined] (repeats 2 times)
 [5] locinfo(::JuliaInterpreter.Frame) at /home/mbauman/.julia/packages/Debugger/Xr8bu/src/locationinfo.jl:7
 [6] print_status(::Base.TTY, ::JuliaInterpreter.Frame; force_lowered::Bool) at /home/mbauman/.julia/packages/Debugger/Xr8bu/src/printing.jl:123
 [7] (::Debugger.var"#10#19"{Debugger.DebuggerState,REPL.LineEdit.Prompt})(::REPL.LineEdit.MIState, ::Base.GenericIOBuffer{Array{UInt8,1}}, ::Bool) at /home/mbauman/.julia/packages/Debugger/Xr8bu/src/repl.jl:81
 [8] #invokelatest#1 at ./essentials.jl:712 [inlined]
 [9] invokelatest at ./essentials.jl:711 [inlined]
 [10] run_interface(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface, ::REPL.LineEdit.MIState) at /home/mbauman/julia/release-1.4/usr/share/julia/stdlib/v1.4/REPL/src/LineEdit.jl:2354
 [11] run_interface(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface) at /home/mbauman/julia/release-1.4/usr/share/julia/stdlib/v1.4/REPL/src/LineEdit.jl:2348
 [12] RunDebugger(::JuliaInterpreter.Frame, ::Nothing, ::Nothing; initial_continue::Bool) at /home/mbauman/.julia/packages/Debugger/Xr8bu/src/repl.jl:158
 [13] RunDebugger at /home/mbauman/.julia/packages/Debugger/Xr8bu/src/repl.jl:4 [inlined] (repeats 2 times)
 [14] top-level scope at /home/mbauman/.julia/packages/Debugger/Xr8bu/src/Debugger.jl:126

Versions:

julia> versioninfo()
Julia Version 1.4.3-pre.0
Commit b5f13c3a1a (2020-05-25 19:42 UTC)
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: Intel(R) Xeon(R) Silver 4114 CPU @ 2.20GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-8.0.1 (ORCJIT, skylake)

(proj) pkg> st
Status `~/iri/IRI/Project.toml`
  [f68482b8] Cthulhu v1.2.0
  [31a5f54b] Debugger v0.6.5
  [5789e2e9] FileIO v1.3.0
  [587475ba] Flux v0.10.4
  [033835bb] JLD2 v0.1.13
  [92933f4c] ProgressMeter v1.3.1
  [e88e6eb3] Zygote v0.4.22

I'm guessing Zygote happens to populate its lineinfo table with a more tightly typed array than Julia itself does... and I'm guessing this may be as easy as adding a <: to that assert.

[timholy]

Any clue whether it would also allow a Vector{LIneNumberNode}?