Breakage on Julia master

[GunnarFarneback]

The JuliaSyntaxHighlighting bump in JuliaLang/julia#59499 caused some kind of unicode breakage:

$ ./julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.13.0-DEV.1103 (2025-09-10)
 _/ |\__'_|_|_|\__'_|  |  Commit f03547b02b* (13 days old master)
|__/                   |

help?> isapprox
search: isapprox isperm iszero


Error showing value of type Markdown.MD:
ERROR: StringIndexError: invalid index [28], valid nearby indices [26]=>'≈', [29]=>'('
Stacktrace:
  [1] string_index_err(s::AbstractString, i::Int64)
    @ Base ./strings/string.jl:12
  [2] SubString{String}(s::String, i::Int64, j::Int64)
    @ Base ./strings/substring.jl:35
  [3] SubString
    @ ./strings/substring.jl:49 [inlined]
  [4] SubString
    @ ./strings/substring.jl:56 [inlined]
  [5] SubString
    @ ./strings/substring.jl:52 [inlined]
  [6] view
    @ ./strings/substring.jl:62 [inlined]
  [7] _hl_annotations!(highlights::Vector{…}, lineage::JuliaSyntaxHighlighting.GreenLineage, ctx::JuliaSyntaxHighlighting.HighlightContext{…}; syntax_errors::Bool)
    @ JuliaSyntaxHighlighting ~/julia/usr/share/julia/stdlib/v1.13/JuliaSyntaxHighlighting/src/JuliaSyntaxHighlighting.jl:320
  [8] _hl_annotations!
    @ ~/julia/usr/share/julia/stdlib/v1.13/JuliaSyntaxHighlighting/src/JuliaSyntaxHighlighting.jl:197 [inlined]
  [9] _hl_annotations!(highlights::Vector{…}, lineage::JuliaSyntaxHighlighting.GreenLineage, ctx::JuliaSyntaxHighlighting.HighlightContext{…}; syntax_errors::Bool)
    @ JuliaSyntaxHighlighting ~/julia/usr/share/julia/stdlib/v1.13/JuliaSyntaxHighlighting/src/JuliaSyntaxHighlighting.jl:366
 [10] _hl_annotations!
    @ ~/julia/usr/share/julia/stdlib/v1.13/JuliaSyntaxHighlighting/src/JuliaSyntaxHighlighting.jl:197 [inlined]
 [11] _hl_annotations!(highlights::Vector{…}, lineage::JuliaSyntaxHighlighting.GreenLineage, ctx::JuliaSyntaxHighlighting.HighlightContext{…}; syntax_errors::Bool)
    @ JuliaSyntaxHighlighting ~/julia/usr/share/julia/stdlib/v1.13/JuliaSyntaxHighlighting/src/JuliaSyntaxHighlighting.jl:366
 [12] _hl_annotations!
    @ ~/julia/usr/share/julia/stdlib/v1.13/JuliaSyntaxHighlighting/src/JuliaSyntaxHighlighting.jl:197 [inlined]
 [13] #_hl_annotations#4
    @ ~/julia/usr/share/julia/stdlib/v1.13/JuliaSyntaxHighlighting/src/JuliaSyntaxHighlighting.jl:186 [inlined]
 [14] _hl_annotations
    @ ~/julia/usr/share/julia/stdlib/v1.13/JuliaSyntaxHighlighting/src/JuliaSyntaxHighlighting.jl:183 [inlined]
 [15] highlight
    @ ~/julia/usr/share/julia/stdlib/v1.13/JuliaSyntaxHighlighting/src/JuliaSyntaxHighlighting.jl:416 [inlined]
 [16] highlight
    @ ~/julia/usr/share/julia/stdlib/v1.13/JuliaSyntaxHighlighting/src/JuliaSyntaxHighlighting.jl:407 [inlined]
 [17] term(io::IOContext{REPL.LimitIO{Base.TTY}}, md::Markdown.Code, columns::Int64)
    @ Markdown ~/julia/usr/share/julia/stdlib/v1.13/Markdown/src/render/terminal/render.jl:120
 [18] term(io::IOContext{REPL.LimitIO{Base.TTY}}, content::Vector{Any}, cols::Int64)
    @ Markdown ~/julia/usr/share/julia/stdlib/v1.13/Markdown/src/render/terminal/render.jl:10
 [19] term(io::IOContext{REPL.LimitIO{Base.TTY}}, md::Markdown.MD, columns::Int64)
    @ Markdown ~/julia/usr/share/julia/stdlib/v1.13/Markdown/src/render/terminal/render.jl:18
 [20] term(io::IOContext{REPL.LimitIO{Base.TTY}}, content::Vector{Any}, cols::Int64)
    @ Markdown ~/julia/usr/share/julia/stdlib/v1.13/Markdown/src/render/terminal/render.jl:13
 [21] term(io::IOContext{REPL.LimitIO{Base.TTY}}, md::Markdown.MD, columns::Int64)
    @ Markdown ~/julia/usr/share/julia/stdlib/v1.13/Markdown/src/render/terminal/render.jl:18
 [22] term(io::IOContext{REPL.LimitIO{Base.TTY}}, content::Vector{Any}, cols::Int64)
    @ Markdown ~/julia/usr/share/julia/stdlib/v1.13/Markdown/src/render/terminal/render.jl:10
 [23] term
    @ ~/julia/usr/share/julia/stdlib/v1.13/Markdown/src/render/terminal/render.jl:18 [inlined]
 [24] term
    @ ~/julia/usr/share/julia/stdlib/v1.13/Markdown/src/render/terminal/render.jl:17 [inlined]
 [25] show(io::IOContext{REPL.LimitIO{Base.TTY}}, ::MIME{Symbol("text/plain")}, md::Markdown.MD)
    @ Markdown ~/julia/usr/share/julia/stdlib/v1.13/Markdown/src/render/terminal/render.jl:231
 [26] show_repl(io::IO, mime::MIME{Symbol("text/plain")}, x::Any)
    @ REPL ~/julia/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:556
 [27] show_limited(io::IO, mime::MIME, x::Any)
    @ REPL ~/julia/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:525
 [28] (::REPL.var"#display##0#display##1"{REPL.REPLDisplay{…}, MIME{…}, Base.RefValue{…}})(io::Any)
    @ REPL ~/julia/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:548
 [29] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL ~/julia/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:861
 [30] display(d::REPL.REPLDisplay, mime::MIME{Symbol("text/plain")}, x::Any)
    @ REPL ~/julia/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:534
 [31] display
    @ ~/julia/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:554 [inlined]
 [32] display(x::Any)
    @ Base.Multimedia ./multimedia.jl:340

[tecosaur]

Thanks for the report, this is fixed in c642041.