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-rw-r--r--lib/dialyzer/src/dialyzer_behaviours.erl10
1 files changed, 7 insertions, 3 deletions
diff --git a/lib/dialyzer/src/dialyzer_behaviours.erl b/lib/dialyzer/src/dialyzer_behaviours.erl
index 1d458b49fc..bbedd3201e 100644
--- a/lib/dialyzer/src/dialyzer_behaviours.erl
+++ b/lib/dialyzer/src/dialyzer_behaviours.erl
@@ -102,14 +102,18 @@ check_all_callbacks(Module, Behaviour, [Cb|Rest],
#state{plt = Plt, codeserver = Codeserver,
records = Records} = State, Acc) ->
{{Behaviour, Function, Arity},
- {{_BehFile, _BehLine}, Callback}} = Cb,
+ {{_BehFile, _BehLine}, Callback, Xtra}} = Cb,
CbMFA = {Module, Function, Arity},
CbReturnType = dialyzer_contracts:get_contract_return(Callback),
CbArgTypes = dialyzer_contracts:get_contract_args(Callback),
Acc0 = Acc,
Acc1 =
case dialyzer_plt:lookup(Plt, CbMFA) of
- 'none' -> [{callback_missing, [Behaviour, Function, Arity]}|Acc0];
+ 'none' ->
+ case lists:member(optional_callback, Xtra) of
+ true -> Acc0;
+ false -> [{callback_missing, [Behaviour, Function, Arity]}|Acc0]
+ end;
{'value', RetArgTypes} ->
Acc00 = Acc0,
{ReturnType, ArgTypes} = RetArgTypes,
@@ -137,7 +141,7 @@ check_all_callbacks(Module, Behaviour, [Cb|Rest],
Acc2 =
case dialyzer_codeserver:lookup_mfa_contract(CbMFA, Codeserver) of
'error' -> Acc1;
- {ok, {{File, Line}, Contract}} ->
+ {ok, {{File, Line}, Contract, _Xtra}} ->
Acc10 = Acc1,
SpecReturnType0 = dialyzer_contracts:get_contract_return(Contract),
SpecArgTypes0 = dialyzer_contracts:get_contract_args(Contract),