storeExpr=$($TOP/src/nix-instantiate/nix-instantiate simple.nix)
echo "store expr is $storeExpr"
outPath=$($TOP/src/nix-store/nix-store -rvv "$storeExpr")
echo "output path is $outPath"
text=$(cat "$outPath"/hello)
if test "$text" != "Hello World!"; then exit 1; fi