@benchmark creates new symbol for each interpolation of a symbol

[omlins]

It should instead create only one new symbol per interpolated symbol and reuse it for multiple interpolations of the same symbol.

The current situation can lead to errors in subsequent code generation as for example here:

julia> @benchmark @parallel ∇=($A->$Ā, $B->$B̄) f!($A, $B, $a) # automatic differentiation of f!
ERROR: LoadError: KeywordArgumentError: variable ##A#440 in ((var"##A#440"->begin
            #= REPL[18]:1 =#
            var"##Ā#441"
        end), (var"##B#442"->begin
            #= REPL[18]:1 =#
            var"##B̄#443"
        end)) is not a positional argument of the kernel call f!(var"##A#444", var"##B#445", var"##a#446").

@benchmark should generate the following in this case (reuse var"##A#440" and var"##B#442"):

@parallel ∇=(var"##A#440"->var"##Ā#441", var"##B#442"->var"##B̄#443") f!(var"##A#440", var"##B#442", var"##a#443")

[gdalle]

Hey @omlins, thanks for the issue. Do you have any idea how to fix it? I'm a little out of my depth with macros here

[gdalle]

Also, a complete MWE would be lovely if you can provide one

[willow-ahrens]

Does anyone know if this is related to #339?