Warning on julia master

[thofma]

I just got

┌ GAP [c863536a-3901-11e9-33e7-d5cd0df7b904]
│  WARNING: could not import REPLCompletions.get_value into GAP

on

julia> versioninfo()
Julia Version 1.10.0-DEV.1128
Commit bc2fa503a8* (2023-04-27 05:52 UTC)
Platform Info:
  OS: macOS (arm64-apple-darwin22.4.0)
  CPU: 8 × Apple M1
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-14.0.6 (ORCJIT, apple-m1)
  Threads: 1 on 4 virtual cores

[ThomasBreuer]

Thanks for the hint.
Apparently REPL/src/REPLCompletions.jl has changed in version 1.10. There is no get_value anymore. The (undocumented) function complete_symbol mentioned in issue #752 does no longer call get_value (and now takes different arguments).

[fingolfin]

So we need to add a check that only defines the get_value method in older Julia versions resp. only when it exists.

And perhaps add an alternative that achieves the same thing in newer OSCAR if it is possible...

[fingolfin]

get_value was removed in this PR JuliaLang/julia#49206, so perhaps studying it will give a hint how to do things now

[fingolfin]

Should be fixed by #866 -- turns out the fix is that the new code in Julia automatically does the right thing and we can just get rid of our hack. Hooray!