err variable trashes global

[laurentbartholdi]

I just discovered the @enum macro, which I love, but does some wrong error handling.

julia> versioninfo()
Julia Version 1.10.0-DEV.343
Commit a526a4a4b3 (2023-01-11 15:23 UTC)
Platform Info:
  OS: macOS (arm64-apple-darwin22.2.0)
  CPU: 10 × Apple M1 Max
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-14.0.6 (ORCJIT, apple-m1)
  Threads: 1 on 8 virtual cores

julia> @enum A test

julia> err = "my precious data"
"my precious data"

julia> @enum A::Bool test2
ERROR: invalid redefinition of constant Main.A
Stacktrace:
 [1] top-level scope
   @ Enums.jl:201
 [2] top-level scope
   @ REPL[4]:1

julia> err
1-element ExceptionStack:
invalid redefinition of constant Main.A
Stacktrace:
 [1] top-level scope
   @ Enums.jl:201
 [2] top-level scope
   @ REPL[4]:1

[martinholters]

Has nothing to do with @enum AFAICT. If an exception reaches the REPL, it is put in err.

[Seelengrab]

Correct - though it should get some documentation, which ans has:

help?> ans
search: ans transpose transcode contains expanduser instances MathConstants readlines LinearIndices leading_ones

  ans

  A variable referring to the last computed value, automatically set at the interactive prompt.

help?> err
search: error errormonitor ErrorException @error stderr InterruptException showerror LoadError InitError

Couldn't find err
Perhaps you meant error, zero, repr, eof, eps, esc, exp, end, nor, rm, xor, Ptr, for, try, @error, stderr or merge
  No documentation found.

  Binding err does not exist.

julia> error("Last Error")
ERROR: Last Error
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:35
 [2] top-level scope
   @ REPL[3]:1

julia> err
1-element ExceptionStack:
Last Error
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:35
 [2] top-level scope
   @ REPL[3]:1

julia> err[1]
(exception = ErrorException("Last Error"), backtrace = Base.StackTraces.StackFrame[error(s::String) at error.jl:35, top-level scope at REPL[3]:1])