1
 2recur =
 3recur += foo
 4simple :=
 5simple += bar
 6recur_empty = foo
 7recur_empty +=
 8simple_empty := bar
 9simple_empty +=
10empty_recur =
11empty_recur +=
12empty_simple :=
13empty_simple +=
14
15all: ; @: $(info recur=/$(recur)/ simple=/$(simple)/ recure=/$(recur_empty)/ simplee=/$(simple_empty)/ erecur=/$(empty_recur)/ esimple=/$(empty_simple)/)