Anomalous “JuliaSyntax parser failed” error - julia 1.11.0-DEV.715

[ghjwp7]

I posted at https://discourse.julialang.org/t/anomalous-juliasyntax-parser-failed-error-julia-1-11-0-dev/116382 regarding a parsing problem with Julia Version 1.11.0-DEV.715 Commit abd00d0 (2023-10-24 02:31 UTC) and got advice to post here (github JuliaLang/julia/issues).

Note, the problem does not occur with other versions than 1.11.0-DEV.715 that I've tried, including Julia Version 1.10.4 48d4fd4 2024-06-04; 1.11.0-beta2 edb3c92 2024-05-29; 1.11.0-rc1 3a35aec 2024-06-25; and 1.12.0-DEV.800 334e4d9 2024-06-28. At the moment I don't have 1.11.0-DEV.715 installed and haven't figured out how to find it or how to install it (if I find it) using jill without jill overwriting 1.11.0-rc1.

Contents here: Part 1: Problem description. Part 2: Program text. Part 3: Anomalous error text, from 1.11.0-DEV.715. Part 4: "Correct" error text, from 1.12.0-DEV.800. Part 5: versioninfo() for 1.11.0-DEV.715 and 1.12.0-DEV.800 on my system

Part 1. Problem description: Given the program shown next, with the second line of main() as shown, Julia Version 1.11.0-DEV.715 anomalously throws an exception after a message, Error: JuliaSyntax parser failed — falling back to flisp!, and before showing a message about the obviously misplaced bracket. See message in Part 3 (shown with file path redacted). Note, if a newline is added before for in the problem line, 1.11.0-DEV.715 no longer throws the anomalous exception.

Part 2: Program text.

module d6
mutable struct SE
    w   ::String
    vb  ::Int
    ve  ::Int
end
vv(s) = 5
function main()
    wi=["aaaa", "bbbb",]
    wo = [SE(w, vv(w), vv(w[4]:end)) for w in sort(unique(wi))]
end
main()
end # module

Part 3: Anomalous error text, from 1.11.0-DEV.715.

┌ Error: JuliaSyntax parser failed — falling back to flisp!
│   exception = (BoundsError(Any[], (1,)), Union{Ptr{Nothing}, Base.InterpreterIP}[Ptr{Nothing} @0x00007ff209c3b5ec, Ptr{Nothing} @0x00007ff1f7d21d17, Ptr{Nothing} @0x00007ff1f73ff479, Ptr{Nothing} @0x00007ff1f73fefa4, Ptr{Nothing} @0x00007ff1f73fefa4, Ptr{Nothing} @0x00007ff1f774659f, Ptr{Nothing} @0x00007ff1f83a3e50, Ptr{Nothing} @0x00007ff1f7682b5c, Ptr{Nothing} @0x00007ff209bb5ccd, Ptr{Nothing} @0x00007ff209bc6329, Ptr{Nothing} @0x00007ff209bb5ccd, Ptr{Nothing} @0x00007ff209bc83e8, Ptr{Nothing} @0x00007ff1f7439d43, Ptr{Nothing} @0x00007ff209bb5ccd, Ptr{Nothing} @0x00007ff209bc83e8, Ptr{Nothing} @0x00007ff1f763b2ca, Ptr{Nothing} @0x00007ff209bb5ccd, Ptr{Nothing} @0x00007ff209bc83e8, Ptr{Nothing} @0x00007ff1f7ab5dcd, Ptr{Nothing} @0x00007ff209bb5ccd, Ptr{Nothing} @0x00007ff209bc83e8, Ptr{Nothing} @0x00007ff1f8143201, Ptr{Nothing} @0x00007ff209bb5ccd, Ptr{Nothing} @0x00007ff1f787d243, Ptr{Nothing} @0x00007ff1f7c075d6, Ptr{Nothing} @0x00007ff209bb5ccd, Ptr{Nothing} @0x00007ff1f7ad4723, Ptr{Nothing} @0x00007ff1f789abcd, Ptr{Nothing} @0x00007ff1f7df648a, Ptr{Nothing} @0x00007ff209bb5ccd, Ptr{Nothing} @0x00007ff1f7ca64e5, Ptr{Nothing} @0x00007ff1f7c98972, Ptr{Nothing} @0x00007ff1f820ed83, Ptr{Nothing} @0x00007ff209bb5ccd, Ptr{Nothing} @0x00007ff209c24012, Ptr{Nothing} @0x00007ff209c24aee, Ptr{Nothing} @0x0000000000401088, Ptr{Nothing} @0x00007ff20a79bd8f, Ptr{Nothing} @0x00007ff20a79be3f, Ptr{Nothing} @0x00000000004010b8])
│   offset = 0
│   code = module d6
mutable struct SE
    w   ::String
    vb  ::Int
    ve  ::Int
end
vv(s) = 5
function main()
    wi=["aaaa", "bbbb",]
    wo = [SE(w, vv(w), vv(w[4]:end)) for w in sort(unique(wi))]
end
main()
end # module

└ @ Base.JuliaSyntax /cache/build/default-amdci4-1/julialang/julia-master/base/JuliaSyntax/src/hooks.jl:258
ERROR: LoadError: syntax: missing last argument in "w[4]:" range expression 
Stacktrace:
 [1] top-level scope
   @ ... /parsererr2.jl:10
in expression starting at ... /parsererr2.jl:10

Part 4: "Correct" error text, from 1.12.0-DEV.800.

ERROR: LoadError: ParseError:
# Error @ ... /parsererr2.jl:10:32
    wi=["aaaa", "bbbb",]
    wo = [SE(w, vv(w), vv(w[4]:end)) for w in sort(unique(wi))]
#                              └ ── missing last argument in range expression
Stacktrace:
 [1] top-level scope
   @ ... /parsererr2.jl:10
 [2] include
   @ ./Base.jl:580 [inlined]
 [3] exec_options(opts::Base.JLOptions)
   @ Base ./client.jl:324
 [4] _start()
   @ Base ./client.jl:532
in expression starting at ... /parsererr2.jl:10

Part 5: versioninfo() for 1.11.0-DEV.715 and 1.12.0-DEV.800:

Julia Version 1.11.0-DEV.715
Commit abd00d09ce3 (2023-10-24 02:31 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 4 × Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
  WORD_SIZE: 64
  LLVM: libLLVM-15.0.7 (ORCJIT, skylake)
  Threads: 1 on 4 virtual cores

Julia Version 1.12.0-DEV.800
Commit 334e4d9f5d5 (2024-06-28 15:46 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 4 × Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
  WORD_SIZE: 64
  LLVM: libLLVM-17.0.6 (ORCJIT, skylake)
Threads: 1 default, 0 interactive, 1 GC (on 4 virtual cores)