current_scope is recommended by an error message but inaccessible.

[LilithHafner]

This is not a great UX:

julia> t = Task(() -> 4)
Task (runnable) @0x0000ffff6826d370

julia> t.scope
ERROR: Querying `scope` is disallowed. Use `current_scope` instead.
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:35
 [2] getproperty(t::Task, field::Symbol)
   @ Base ./task.jl:184
 [3] top-level scope
   @ REPL[65]:1

julia> current_scope
ERROR: UndefVarError: `current_scope` not defined in `Main`
Suggestion: check for spelling errors or missing imports.

julia> t.current_scope
ERROR: type Task has no field current_scope
Stacktrace:
 [1] getproperty(t::Task, field::Symbol)
   @ Base ./task.jl:186
 [2] top-level scope
   @ REPL[67]:1

julia> Base.current_scope
ERROR: UndefVarError: `current_scope` not defined in `Base`
Suggestion: check for spelling errors or missing imports.
Stacktrace:
 [1] getproperty(x::Module, f::Symbol)
   @ Base ./Base.jl:42
 [2] top-level scope
   @ REPL[68]:1

help?> current_scope
search: current_task current_exceptions

Couldn't find current_scope
Perhaps you meant current_task
  No documentation found.

  Binding current_scope does not exist.

julia> Core.current_scope
current_scope (built-in function)

julia/base/task.jl

Line 183 in e57a7e4

error("Querying `scope` is disallowed. Use `current_scope` instead.")

Either the error should mention that the function is internal, or it should specify how to get a public handle on that function.

The error & hint was added in #52309
cc @Keno

[Keno]

Core.current_scope is private, but t.scope is extra private ;)

[Keno]

(Because accessing t.scope would be UB if allowed)

[LilithHafner]

Is there any public API for this? Perhaps point folks to scoped values & mention the internal Core.current_scope()?

[Keno]

It's an internal implementation detail of ScopedValues, although in theory a package could use it for something else, they'd just be using private APIs