diff options
Diffstat (limited to 'lib/hipe/cerl')
| -rw-r--r-- | lib/hipe/cerl/erl_bif_types.erl | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/lib/hipe/cerl/erl_bif_types.erl b/lib/hipe/cerl/erl_bif_types.erl index 9df3dedb45..1f0247a040 100644 --- a/lib/hipe/cerl/erl_bif_types.erl +++ b/lib/hipe/cerl/erl_bif_types.erl @@ -2337,8 +2337,7 @@ type(lists, flatten, 1, Xs) -> t_list(); false -> X2 = type(lists, flatten, 1, [t_inf(X1, t_list())]), - t_sup(t_list(t_subtract(X1, t_list())), - X2) + t_sup(t_list(t_subtract(X1, t_list())), X2) end end end); @@ -2349,10 +2348,20 @@ type(lists, flatmap, 2, Xs) -> true -> t_nil(); false -> case check_fun_application(F, [t_list_elements(List)]) of - ok -> - case t_is_cons(List) of - true -> t_nonempty_list(t_list_elements(t_fun_range(F))); - false -> t_list(t_list_elements(t_fun_range(F))) + ok -> + R = t_fun_range(F), + case t_is_nil(R) of + true -> t_nil(); + false -> + Elems = t_list_elements(R), + case t_is_cons(List) of + true -> + case t_is_subtype(t_nil(), R) of + true -> t_list(Elems); + false -> t_nonempty_list(Elems) + end; + false -> t_list(Elems) + end end; error -> case t_is_cons(List) of |