id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
3659	two-dimensional PArrays in data parallel code	ams	rl	"Hi -- Is it possible to create two-dimensional PArrays? It seems like an expression like

{{{
   fromList [fromList [1]]
}}}

would do it (where fromList is from Data.Array.Parallel.Prelude), but a type class constraint seems not to be matched here:
{{{
    No instance for (Elt (PArray Int))
      arising from a use of `fromList' at Main.hs:8:16-42
    Possible fix: add an instance declaration for (Elt (PArray Int))
}}}
(Details below.) Are there any other ways?

Thanks -- Adam Shaw

{{{
$ cat Main.hs
import Data.Array.Parallel.PArray as P

main :: IO ()
main
  = do
      let v2D = P.fromList [P.fromList [1::Int]]
      print v2D

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.13.20090929

$ ghc -fdph-seq Main.hs

Main.hs:6:16:
    No instance for (Elt (PArray Int))
      arising from a use of `fromList' at Main.hs:6:16-47
    Possible fix: add an instance declaration for (Elt (PArray Int))
    In the expression: fromList [fromList [1 :: Int]]
    In the definition of `v2D': v2D = fromList [fromList [1 :: Int]]
    In the expression:
        do { let v2D = fromList ...;
             print v2D }
}}}"	feature request	closed	normal		Compiler	6.10.4	worksforme		rl@…	Unknown/Multiple	Unknown/Multiple