BER: Suppress dialyzer warnings for encode_bit_string/4

We don't want to touch the code used for encoding BIT STRINGs when
'legacy_erl_types' is active, since it will be removed within two
or three major releases. But we do want to suppress the dialyzer
warnings in the meantime. The easiest way is to call
encode_bit_string/4 with unknown types from an exported function
that is never actually called like this:

-export(['dialyzer-suppressions'/0]).

'dialyzer-suppressions'(Arg) ->
    {A,B,C,D} = Arg,
    encode_bit_string(A, B, C, D),
    ok.

1 files changed, 10 insertions, 2 deletions

diff --git a/lib/asn1/src/asn1ct_func.erl b/lib/asn1/src/asn1ct_func.erl
index 33f998722a..fb94f65b32 100644
--- a/lib/asn1/src/asn1ct_func.erl
+++ b/lib/asn1/src/asn1ct_func.erl
@@ -19,7 +19,8 @@
 %%
 
 -module(asn1ct_func).
--export([start_link/0,need/1,call/3,call_gen/3,call_gen/4,generate/1]).
+-export([start_link/0,need/1,call/3,call_gen/3,call_gen/4,
+	 generate/1,is_used/1]).
 -export([init/1,handle_call/3,handle_cast/2,terminate/2]).
 
 start_link() ->
@@ -63,6 +64,10 @@ generate(Fd) ->
     Funcs = sofs:to_external(Funcs0),
     ok = file:write(Fd, Funcs).
 
+is_used({_,_,_}=MFA) ->
+    req({is_used,MFA}).
+
+
 req(Req) ->
     gen_server:call(get(?MODULE), Req, infinity).
 
@@ -103,7 +108,10 @@ handle_call({gen_func,Prefix,Key,GenFun}, _From, #st{gen=G0,gc=Gc0}=St) ->
 	    {reply,Name,St#st{gen=G,gc=Gc}};
 	{value,{Name,_}} ->
 	    {reply,Name,St}
-    end.
+    end;
+handle_call({is_used,MFA}, _From, #st{used=Used}=St) ->
+    {reply,gb_sets:is_member(MFA, Used),St}.
+
 
 terminate(_, _) ->
     ok.