try workaround for #384

Author: simeonschaub

src/mapreduce.jl

@@ -45,7 +45,8 @@ Base.@propagate_inbounds _map_getindex(args::Tuple{}, I) = ()
 # Reduce an array across the grid. All elements to be processed can be addressed by the
 # product of the two iterators `Rreduce` and `Rother`, where the latter iterator will have
 # singleton entries for the dimensions that should be reduced (and vice versa).
-function partial_mapreduce_device(f, op, neutral, maxitems, Rreduce, Rother, R, As...)
+function partial_mapreduce_device(f, op, neutral, maxitems, Rreduce, Rother, R, A)
+    As = (A,)
     # decompose the 1D hardware indices into separate ones for reduction (across items
     # and possibly groups if it doesn't fit) and other elements (remaining groups)
     localIdx_reduce = get_local_id()