Feature request: better error message for @which a .+ b

[yuxi-liu-wired]

julia> @which [2 3] .+ [1 2]
ERROR: UndefVarError: .+ not defined

My intuition is something like a .+ b gets changed to broadcasted_+(a, b), and was hoping it would return something like
broadcasted_+(a::Array{Int64}...)
but now I see it wouldn’t make sense.

The error message could be made to say something like
Did you mean '@which broadcast(+, a, b)'?

[mbauman]

Duplicate of #28615