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-rw-r--r--lib/hipe/cerl/erl_types.erl15
1 files changed, 10 insertions, 5 deletions
diff --git a/lib/hipe/cerl/erl_types.erl b/lib/hipe/cerl/erl_types.erl
index 91ee104f77..0a1b3c495a 100644
--- a/lib/hipe/cerl/erl_types.erl
+++ b/lib/hipe/cerl/erl_types.erl
@@ -2235,16 +2235,21 @@ t_has_var_list([]) -> false.
-spec t_collect_vars(erl_type()) -> [erl_type()].
t_collect_vars(T) ->
- t_collect_vars(T, []).
+ Vs = t_collect_vars(T, maps:new()),
+ [V || {V, _} <- maps:to_list(Vs)].
--spec t_collect_vars(erl_type(), [erl_type()]) -> [erl_type()].
+-type ctab() :: #{erl_type() => 'any'}.
+
+-spec t_collect_vars(erl_type(), ctab()) -> ctab().
t_collect_vars(?var(_) = Var, Acc) ->
- ordsets:add_element(Var, Acc);
+ maps:put(Var, any, Acc);
t_collect_vars(?function(Domain, Range), Acc) ->
- ordsets:union(t_collect_vars(Domain, Acc), t_collect_vars(Range, []));
+ Acc1 = t_collect_vars(Domain, Acc),
+ t_collect_vars(Range, Acc1);
t_collect_vars(?list(Contents, Termination, _), Acc) ->
- ordsets:union(t_collect_vars(Contents, Acc), t_collect_vars(Termination, []));
+ Acc1 = t_collect_vars(Contents, Acc),
+ t_collect_vars(Termination, Acc1);
t_collect_vars(?product(Types), Acc) ->
t_collect_vars_list(Types, Acc);
t_collect_vars(?tuple(?any, ?any, ?any), Acc) ->