`Error: Error in the keymap` in autocompleting properties involving copy of adjoint matrices

[jishnub]

This is triggered by the copy(A'). line in the following (might need to wait for a few seconds after the dot):

julia> A = zeros(2,2)
2×2 Matrix{Float64}:
 0.0  0.0
 0.0  0.0

julia> copy(A').┌ Error: Error in the keymap
│   exception =
│    BoundsError: attempt to access 0-element UnitRange{Int64} at index [1]
│    Stacktrace:
│      [1] throw_boundserror(A::UnitRange{Int64}, I::Int64)
│        @ Base ./essentials.jl:14
│      [2] _getindex
│        @ ./range.jl:946 [inlined]
│      [3] getindex
│        @ ./array.jl:3082 [inlined]
│      [4] complete_identifiers!(suggestions::Vector{REPL.REPLCompletions.Completion}, context_module::Module, string::String, name::String, pos::Int64, separatorpos::Int64, startpos::Int64; comp_keywords::Bool, complete_modules_only::Bool, shift::Bool)
│        @ REPL.REPLCompletions ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/REPLCompletions.jl:1200
│      [5] complete_identifiers!
│        @ ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/REPLCompletions.jl:1113 [inlined]
│      [6] completions(string::String, pos::Int64, context_module::Module, shift::Bool, hint::Bool)
│        @ REPL.REPLCompletions ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/REPLCompletions.jl:1475
│      [7] complete_line(c::REPL.REPLCompletionProvider, s::REPL.LineEdit.PromptState, mod::Module; hint::Bool)
│        @ REPL ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/REPL.jl:774
│      [8] check_for_hint(s::REPL.LineEdit.MIState)
│        @ REPL.LineEdit ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:385
│      [9] (::REPL.LineEdit.var"#186#187")(s::REPL.LineEdit.MIState, data::Any, c::Union{Char, SubString{String}, String})
│        @ REPL.LineEdit ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2538
│     [10] #invokelatest#1
│        @ ./essentials.jl:1048 [inlined]
│     [11] invokelatest
│        @ ./essentials.jl:1045 [inlined]
│     [12] (::REPL.LineEdit.var"#match_input##0#match_input##1"{REPL.LineEdit.var"#186#187", String})(s::Any, p::Any)
│        @ REPL.LineEdit ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:1722
│     [13] macro expansion
│        @ ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2872 [inlined]
│     [14] macro expansion
│        @ ./lock.jl:287 [inlined]
│     [15] (::REPL.LineEdit.var"#prompt!##2#prompt!##3"{REPL.Terminals.TTYTerminal, REPL.LineEdit.ModalInterface, REPL.LineEdit.MIState, ReentrantLock, REPL.LineEdit.Prompt})()
│        @ REPL.LineEdit ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2862
└ @ REPL.LineEdit ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2874

julia> versioninfo()
Julia Version 1.12.0-DEV.1242
Commit c3af4fc2456 (2024-09-24 09:48 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 8 × Intel(R) Core(TM) i5-10310U CPU @ 1.70GHz
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, skylake)
Threads: 1 default, 0 interactive, 1 GC (on 8 virtual cores)
Environment:
  JULIA_EDITOR = subl

Julia nightly installed using juliaup. I can replicate this on v"1.10.5" and v"1.11.0-rc3" as well. On v1.10, I needed to press TAB after the dot to trigger the error, whereas on v1.11 and nightly, this happens right after the dot if I wait for a few seconds.

[IanButterworth]

Just noting that to reproduce this you just need to type copy(A')., A doesn't need to exist.

The issue I believe is that when searching for braces we're assuming ' is only used to quote, not accounting for uses to transpose.
It's also tricky because multiple can be used to transpose repeatedly like A''''.

julia/stdlib/REPL/src/REPLCompletions.jl

Lines 505 to 506 in 6387e13

	elseif c == '\''
	in_single_quotes = true