Incorrect docstring with erroneous ? in REPL help mode

[malmaud]

Accidently typed a ? when already at help mode and got this strange result

help?> ?@parallel
  *(x, y...)

  Multiplication operator. x*y*z*... calls this function with all arguments, i.e. *(x, y, z, ...).

[jiahao]

It might be a lookup issue. Same thing happens with ?@! and a bunch of things I tried that start with ?@.

[yuyichao]

It's a multiplication

julia> :(?@parallel)
:((?) * @parallel())

[jiahao]

Oh, so it's #1910 #6286 again

[malmaud]

Ah yes, now it makes sense.

[KristofferC]

This now gives:

help?> ?@parallel
ERROR: ArgumentError: wrong number of arguments to @parallel

Is that good enough to close?

[martinholters]

As long as we want to keep the parsing of :(?@parallel) to be the multiplication by juxtaposition, this is probably as good as it gets without any special-casing. Note that if @parallel is replaced by a macro takes accepts zero arguments, the error becomes

ERROR: UndefVarError: ? not defined

[KristofferC]

This has not really anything to do with the docsystem then. Also giving an error that points to the ? is good since the user will then likely find the error.