std.parrallelism + scopedTask what is the right syntax

[bioinfornatics]

Hi,

I have a function like this:

void writeRegionOutLimit( in string outFile, ref const size_t[] 
table, bool delegate(size_t) lambda, in string delimiter = ",")

when I use it with scoped task compiling fail:

  auto job4   = scopedTask!writeRegionOutLimit( outFile ~ 
"min_warn.csv", table, (a => a < stat.quartile1 ), delimiter );

Error: template std.parallelism.scopedTask does not match any 
function template declaration
  Error: template std.parallelism.scopedTask cannot deduce 
template function from argument types 
!(writeRegionOutLimit)(string,ulong[],void,string)


what is the problem ?