type TaskJoinArg<Ret> = fn(&Ret, &[Ret]) -> Ret;
Similar to TaskJoin but takes an extra argument sent directly
from the task in algorithms with ReduceStyle::Arg.
Prefix searches with a type followed by a colon (e.g.
fn:) to restrict the search to a given type.
Accepted types are: fn, mod,
struct, enum,
trait, typedef (or
tdef).
Search functions by type signature (e.g.
vec -> usize)