Merge branch 'hasse/dialyzer/improve_from_form/OTP-13547'

* hasse/dialyzer/improve_from_form/OTP-13547:
  Update primary bootstrap
  stdlib: Correct types and specs
  dialyzer: Minor adjustments
  dialyzer: Suppress unmatched_return for send/2
  dialyzer: Improve the translation of forms to types
  dialyzer: Use a cache when translating forms to types
  dialyzer: Prepare erl_types:t_from_form() for a cache
  dialyzer: Optimize erl_types:t_form_form()
  dialyzer: Correct types
  syntax_tools: Correct types
  erts: Correct character repr in doc of the abstract format
  stdlib: Correct types and specs

4 files changed, 193 insertions, 114 deletions

diff --git a/lib/dialyzer/src/dialyzer_contracts.erl b/lib/dialyzer/src/dialyzer_contracts.erl
index 272ad10e90..976a2b8955 100644
--- a/lib/dialyzer/src/dialyzer_contracts.erl
+++ b/lib/dialyzer/src/dialyzer_contracts.erl
@@ -53,7 +53,9 @@
 %% to expand records and/or remote types that they might contain.
 %%-----------------------------------------------------------------------
 
--type tmp_contract_fun() :: fun((sets:set(mfa()), types()) -> contract_pair()).
+-type cache() :: ets:tid().
+-type tmp_contract_fun() ::
+        fun((sets:set(mfa()), types(), cache()) -> contract_pair()).
 
 -record(tmp_contract, {contract_funs = [] :: [tmp_contract_fun()],
 		       forms	     = [] :: [{_, _}]}).
@@ -153,19 +155,30 @@ process_contract_remote_types(CodeServer) ->
   ExpTypes = dialyzer_codeserver:get_exported_types(CodeServer),
   RecordDict = dialyzer_codeserver:get_records(CodeServer),
   ContractFun =
-    fun({_M, _F, _A}, {File, #tmp_contract{contract_funs = CFuns, forms = Forms}, Xtra}) ->
-	NewCs = [CFun(ExpTypes, RecordDict) || CFun <- CFuns],
-	Args = general_domain(NewCs),
-	{File, #contract{contracts = NewCs, args = Args, forms = Forms}, Xtra}
+    fun({{_M, _F, _A}=MFA, {File, TmpContract, Xtra}}, C0) ->
+        #tmp_contract{contract_funs = CFuns, forms = Forms} = TmpContract,
+        {NewCs, C2} = lists:mapfoldl(fun(CFun, C1) ->
+                                         CFun(ExpTypes, RecordDict, C1)
+                                     end, C0, CFuns),
+        Args = general_domain(NewCs),
+        Contract = #contract{contracts = NewCs, args = Args, forms = Forms},
+        {{MFA, {File, Contract, Xtra}}, C2}
     end,
   ModuleFun =
-    fun(_ModuleName, ContractDict) ->
-	dict:map(ContractFun, ContractDict)
+    fun({ModuleName, ContractDict}, C3) ->
+        {NewContractList, C4} =
+          lists:mapfoldl(ContractFun, C3, dict:to_list(ContractDict)),
+        {{ModuleName, dict:from_list(NewContractList)}, C4}
     end,
-  NewContractDict = dict:map(ModuleFun, TmpContractDict),
-  NewCallbackDict = dict:map(ModuleFun, TmpCallbackDict),
+  Cache = erl_types:cache__new(),
+  {NewContractList, C5} =
+    lists:mapfoldl(ModuleFun, Cache, dict:to_list(TmpContractDict)),
+  {NewCallbackList, _C6} =
+    lists:mapfoldl(ModuleFun, C5, dict:to_list(TmpCallbackDict)),
+  NewContractDict = dict:from_list(NewContractList),
+  NewCallbackDict = dict:from_list(NewCallbackList),
   dialyzer_codeserver:finalize_contracts(NewContractDict, NewCallbackDict,
-					 CodeServer).
+                                         CodeServer).
 
 -type opaques_fun() :: fun((module()) -> [erl_types:erl_type()]).
 
@@ -431,19 +444,19 @@ contract_from_form(Forms, MFA, RecDict, FileLine) ->
 contract_from_form([{type, _, 'fun', [_, _]} = Form | Left], MFA, RecDict,
 		   FileLine, TypeAcc, FormAcc) ->
   TypeFun =
-    fun(ExpTypes, AllRecords) ->
-	NewType =
+    fun(ExpTypes, AllRecords, Cache) ->
+	{NewType, NewCache} =
 	  try
-            from_form_with_check(Form, ExpTypes, MFA, AllRecords)
+            from_form_with_check(Form, ExpTypes, MFA, AllRecords, Cache)
 	  catch
 	    throw:{error, Msg} ->
 	      {File, Line} = FileLine,
 	      NewMsg = io_lib:format("~s:~p: ~s", [filename:basename(File),
-						     Line, Msg]),
+                                                   Line, Msg]),
 	      throw({error, NewMsg})
 	  end,
         NewTypeNoVars = erl_types:subst_all_vars_to_any(NewType),
-	{NewTypeNoVars, []}
+	{{NewTypeNoVars, []}, NewCache}
     end,
   NewTypeAcc = [TypeFun | TypeAcc],
   NewFormAcc = [{Form, []} | FormAcc],
@@ -452,13 +465,15 @@ contract_from_form([{type, _L1, bounded_fun,
 		     [{type, _L2, 'fun', [_, _]} = Form, Constr]}| Left],
 		   MFA, RecDict, FileLine, TypeAcc, FormAcc) ->
   TypeFun =
-    fun(ExpTypes, AllRecords) ->
-	{Constr1, VarDict} =
-	  process_constraints(Constr, MFA, RecDict, ExpTypes, AllRecords),
-        NewType = from_form_with_check(Form, ExpTypes, MFA, AllRecords,
-                                       VarDict),
+    fun(ExpTypes, AllRecords, Cache) ->
+	{Constr1, VarTable, Cache1} =
+	  process_constraints(Constr, MFA, RecDict, ExpTypes, AllRecords,
+                              Cache),
+        {NewType, NewCache} =
+          from_form_with_check(Form, ExpTypes, MFA, AllRecords,
+                               VarTable, Cache1),
         NewTypeNoVars = erl_types:subst_all_vars_to_any(NewType),
-	{NewTypeNoVars, Constr1}
+	{{NewTypeNoVars, Constr1}, NewCache}
     end,
   NewTypeAcc = [TypeFun | TypeAcc],
   NewFormAcc = [{Form, Constr} | FormAcc],
@@ -466,74 +481,91 @@ contract_from_form([{type, _L1, bounded_fun,
 contract_from_form([], _MFA, _RecDict, _FileLine, TypeAcc, FormAcc) ->
   {lists:reverse(TypeAcc), lists:reverse(FormAcc)}.
 
-process_constraints(Constrs, MFA, RecDict, ExpTypes, AllRecords) ->
-  Init0 = initialize_constraints(Constrs, MFA, RecDict, ExpTypes, AllRecords),
+process_constraints(Constrs, MFA, RecDict, ExpTypes, AllRecords, Cache) ->
+  {Init0, NewCache} = initialize_constraints(Constrs, MFA, RecDict, ExpTypes,
+                                             AllRecords, Cache),
   Init = remove_cycles(Init0),
-  constraints_fixpoint(Init, MFA, RecDict, ExpTypes, AllRecords).
+  constraints_fixpoint(Init, MFA, RecDict, ExpTypes, AllRecords, NewCache).
 
-initialize_constraints(Constrs, MFA, RecDict, ExpTypes, AllRecords) ->
-  initialize_constraints(Constrs, MFA, RecDict, ExpTypes, AllRecords, []).
+initialize_constraints(Constrs, MFA, RecDict, ExpTypes, AllRecords, Cache) ->
+  initialize_constraints(Constrs, MFA, RecDict, ExpTypes, AllRecords,
+                         Cache, []).
 
-initialize_constraints([], _MFA, _RecDict, _ExpTypes, _AllRecords, Acc) ->
-  Acc;
-initialize_constraints([Constr|Rest], MFA, RecDict, ExpTypes, AllRecords, Acc) ->
+initialize_constraints([], _MFA, _RecDict, _ExpTypes, _AllRecords,
+                       Cache, Acc) ->
+  {Acc, Cache};
+initialize_constraints([Constr|Rest], MFA, RecDict, ExpTypes, AllRecords,
+                       Cache, Acc) ->
   case Constr of
     {type, _, constraint, [{atom, _, is_subtype}, [Type1, Type2]]} ->
       VarTable = erl_types:var_table__new(),
-      T1 = final_form(Type1, ExpTypes, MFA, AllRecords, VarTable),
+      {T1, NewCache} =
+        final_form(Type1, ExpTypes, MFA, AllRecords, VarTable, Cache),
       Entry = {T1, Type2},
-      initialize_constraints(Rest, MFA, RecDict, ExpTypes, AllRecords, [Entry|Acc]);
+      initialize_constraints(Rest, MFA, RecDict, ExpTypes, AllRecords,
+                             NewCache, [Entry|Acc]);
     {type, _, constraint, [{atom,_,Name}, List]} ->
       N = length(List),
       throw({error,
 	     io_lib:format("Unsupported type guard ~w/~w\n", [Name, N])})
   end.
 
-constraints_fixpoint(Constrs, MFA, RecDict, ExpTypes, AllRecords) ->
+constraints_fixpoint(Constrs, MFA, RecDict, ExpTypes, AllRecords, Cache) ->
   VarTable = erl_types:var_table__new(),
-  VarDict =
-    constraints_to_dict(Constrs, MFA, RecDict, ExpTypes, AllRecords, VarTable),
-  constraints_fixpoint(VarDict, MFA, Constrs, RecDict, ExpTypes, AllRecords).
-
-constraints_fixpoint(OldVarDict, MFA, Constrs, RecDict, ExpTypes, AllRecords) ->
-  NewVarDict =
-    constraints_to_dict(Constrs, MFA, RecDict, ExpTypes, AllRecords, OldVarDict),
-  case NewVarDict of
-    OldVarDict ->
+  {VarTab, NewCache} =
+    constraints_to_dict(Constrs, MFA, RecDict, ExpTypes, AllRecords,
+                        VarTable, Cache),
+  constraints_fixpoint(VarTab, MFA, Constrs, RecDict, ExpTypes,
+                       AllRecords, NewCache).
+
+constraints_fixpoint(OldVarTab, MFA, Constrs, RecDict, ExpTypes,
+                     AllRecords, Cache) ->
+  {NewVarTab, NewCache} =
+    constraints_to_dict(Constrs, MFA, RecDict, ExpTypes, AllRecords,
+                        OldVarTab, Cache),
+  case NewVarTab of
+    OldVarTab ->
       Fun =
 	fun(Key, Value, Acc) ->
 	    [{subtype, erl_types:t_var(Key), Value}|Acc]
 	end,
-      FinalConstrs = maps:fold(Fun, [], NewVarDict),
-      {FinalConstrs, NewVarDict};
+      FinalConstrs = maps:fold(Fun, [], NewVarTab),
+      {FinalConstrs, NewVarTab, NewCache};
     _Other ->
-      constraints_fixpoint(NewVarDict, MFA, Constrs, RecDict, ExpTypes, AllRecords)
+      constraints_fixpoint(NewVarTab, MFA, Constrs, RecDict, ExpTypes,
+                           AllRecords, NewCache)
   end.
 
-final_form(Form, ExpTypes, MFA, AllRecords, VarDict) ->
-  from_form_with_check(Form, ExpTypes, MFA, AllRecords, VarDict).
+final_form(Form, ExpTypes, MFA, AllRecords, VarTable, Cache) ->
+  from_form_with_check(Form, ExpTypes, MFA, AllRecords, VarTable, Cache).
 
-from_form_with_check(Form, ExpTypes, MFA, AllRecords) ->
+from_form_with_check(Form, ExpTypes, MFA, AllRecords, Cache) ->
   VarTable = erl_types:var_table__new(),
-  from_form_with_check(Form, ExpTypes, MFA, AllRecords, VarTable).
+  from_form_with_check(Form, ExpTypes, MFA, AllRecords, VarTable, Cache).
 
-from_form_with_check(Form, ExpTypes, MFA, AllRecords, VarDict) ->
+from_form_with_check(Form, ExpTypes, MFA, AllRecords, VarTable, Cache) ->
   Site = {spec, MFA},
-  erl_types:t_check_record_fields(Form, ExpTypes, Site, AllRecords, VarDict),
-  erl_types:t_from_form(Form, ExpTypes, Site, AllRecords, VarDict).
-
-constraints_to_dict(Constrs, MFA, RecDict, ExpTypes, AllRecords, VarDict) ->
-  Subtypes =
-    constraints_to_subs(Constrs, MFA, RecDict, ExpTypes, AllRecords, VarDict, []),
-  insert_constraints(Subtypes).
-
-constraints_to_subs([], _MFA, _RecDict, _ExpTypes, _AllRecords, _VarDict, Acc) ->
-  Acc;
-constraints_to_subs([C|Rest], MFA, RecDict, ExpTypes, AllRecords, VarDict, Acc) ->
-  {T1, Form2} = C,
-  T2 = final_form(Form2, ExpTypes, MFA, AllRecords, VarDict),
+  C1 = erl_types:t_check_record_fields(Form, ExpTypes, Site, AllRecords,
+                                       VarTable, Cache),
+  erl_types:t_from_form(Form, ExpTypes, Site, AllRecords, VarTable, C1).
+
+constraints_to_dict(Constrs, MFA, RecDict, ExpTypes, AllRecords,
+                    VarTab, Cache) ->
+  {Subtypes, NewCache} =
+    constraints_to_subs(Constrs, MFA, RecDict, ExpTypes, AllRecords,
+                        VarTab, Cache, []),
+  {insert_constraints(Subtypes), NewCache}.
+
+constraints_to_subs([], _MFA, _RecDict, _ExpTypes, _AllRecords,
+                    _VarTab, Cache, Acc) ->
+  {Acc, Cache};
+constraints_to_subs([{T1, Form2}|Rest], MFA, RecDict, ExpTypes, AllRecords,
+                    VarTab, Cache, Acc) ->
+  {T2, NewCache} =
+    final_form(Form2, ExpTypes, MFA, AllRecords, VarTab, Cache),
   NewAcc = [{subtype, T1, T2}|Acc],
-  constraints_to_subs(Rest, MFA, RecDict, ExpTypes, AllRecords, VarDict, NewAcc).
+  constraints_to_subs(Rest, MFA, RecDict, ExpTypes, AllRecords,
+                      VarTab, NewCache, NewAcc).
 
 %% Replaces variables with '_' when necessary to break up cycles among
 %% the constraints.
@@ -647,6 +679,7 @@ get_invalid_contract_warnings_funs([{MFA, {FileLine, Contract, _Xtra}}|Left],
     {value, {Ret, Args}} ->
       Sig = erl_types:t_fun(Args, Ret),
       {M, _F, _A} = MFA,
+      %% io:format("MFA ~p~n", [MFA]),
       Opaques = FindOpaques(M),
       {File, Line} = FileLine,
       WarningInfo = {File, Line, MFA},
@@ -795,7 +828,7 @@ is_remote_types_related(Contract, CSig, Sig, MFA, RecDict) ->
 
 t_from_forms_without_remote([{FType, []}], MFA, RecDict) ->
   Site = {spec, MFA},
-  Type1 = erl_types:t_from_form_without_remote(FType, Site, RecDict),
+  {Type1, _} = erl_types:t_from_form_without_remote(FType, Site, RecDict),
   {ok, erl_types:subst_all_vars_to_any(Type1)};
 t_from_forms_without_remote([{_FType, _Constrs}], _MFA, _RecDict) ->
   %% 'When' constraints
diff --git a/lib/dialyzer/src/dialyzer_dataflow.erl b/lib/dialyzer/src/dialyzer_dataflow.erl
index 3349b12932..9399789464 100644
--- a/lib/dialyzer/src/dialyzer_dataflow.erl
+++ b/lib/dialyzer/src/dialyzer_dataflow.erl
@@ -522,7 +522,7 @@ handle_apply_or_call([{TypeOfApply, {Fun, Sig, Contr, LocalRet}}|Left],
   ?debug("RetWithoutLocal: ~s\n", [erl_types:t_to_string(RetWithoutLocal)]),
   ?debug("BifRet: ~s\n", [erl_types:t_to_string(BifRange(NewArgTypes))]),
   ?debug("SigRange: ~s\n", [erl_types:t_to_string(SigRange)]),
-  ?debug("ContrRet: ~s\n", [erl_types:t_to_string(CRange(NewArgTypes))]),
+  ?debug("ContrRet: ~s\n", [erl_types:t_to_string(ContrRet)]),
   ?debug("LocalRet: ~s\n", [erl_types:t_to_string(LocalRet)]),
 
   State1 =
@@ -2954,11 +2954,15 @@ is_call_to_send(Tree) ->
       Arity = cerl:call_arity(Tree),
       cerl:is_c_atom(Mod)
 	andalso cerl:is_c_atom(Name)
-	andalso (cerl:atom_val(Name) =:= '!')
+        andalso is_send(cerl:atom_val(Name))
 	andalso (cerl:atom_val(Mod) =:= erlang)
 	andalso (Arity =:= 2)
   end.
 
+is_send('!') -> true;
+is_send(send) -> true;
+is_send(_) -> false.
+
 is_lc_simple_list(Tree, TreeType, State) ->
   Opaques = State#state.opaques,
   Ann = cerl:get_ann(Tree),
@@ -3067,7 +3071,10 @@ state__add_warning(#state{warnings = Warnings, warning_mode = true} = State,
         false ->
           WarningInfo = {get_file(Ann), get_line(Ann), State#state.curr_fun},
           Warn = {Tag, WarningInfo, Msg},
-          ?debug("MSG ~s\n", [dialyzer:format_warning(Warn)]),
+          case Tag of
+            ?WARN_CONTRACT_RANGE -> ok;
+            _ -> ?debug("MSG ~s\n", [dialyzer:format_warning(Warn)])
+          end,
           State#state{warnings = [Warn|Warnings]}
       end
   end.
diff --git a/lib/dialyzer/src/dialyzer_utils.erl b/lib/dialyzer/src/dialyzer_utils.erl
index d37701f03b..76a5cf3d0b 100644
--- a/lib/dialyzer/src/dialyzer_utils.erl
+++ b/lib/dialyzer/src/dialyzer_utils.erl
@@ -194,15 +194,18 @@ get_core_from_abstract_code(AbstrCode, Opts) ->
 %%
 %% ============================================================================
 
+-type type_table() :: erl_types:type_table().
+-type mod_records()   :: dict:dict(module(), type_table()).
+
 -spec get_record_and_type_info(abstract_code()) ->
-	{'ok', dict:dict()} | {'error', string()}.
+	{'ok', type_table()} | {'error', string()}.
 
 get_record_and_type_info(AbstractCode) ->
   Module = get_module(AbstractCode),
   get_record_and_type_info(AbstractCode, Module, dict:new()).
 
--spec get_record_and_type_info(abstract_code(), module(), dict:dict()) ->
-	{'ok', dict:dict()} | {'error', string()}.
+-spec get_record_and_type_info(abstract_code(), module(), type_table()) ->
+	{'ok', type_table()} | {'error', string()}.
 
 get_record_and_type_info(AbstractCode, Module, RecDict) ->
   get_record_and_type_info(AbstractCode, Module, RecDict, "nofile").
@@ -299,92 +302,117 @@ get_record_fields([], _RecDict, Acc) ->
 process_record_remote_types(CServer) ->
   TempRecords = dialyzer_codeserver:get_temp_records(CServer),
   ExpTypes = dialyzer_codeserver:get_exported_types(CServer),
-  TempRecords1 = process_opaque_types0(TempRecords, ExpTypes),
+  Cache = erl_types:cache__new(),
+  {TempRecords1, Cache1} =
+    process_opaque_types0(TempRecords, ExpTypes, Cache),
+  %% A cache (not the field type cache) is used for speeding things up a bit.
+  VarTable = erl_types:var_table__new(),
   ModuleFun =
-    fun(Module, Record) ->
+    fun({Module, Record}, C0) ->
         RecordFun =
-          fun(Key, Value) ->
+          fun({Key, Value}, C2) ->
               case Key of
                 {record, Name} ->
                   FieldFun =
-                    fun(Arity, Fields) ->
+                    fun({Arity, Fields}, C4) ->
                         Site = {record, {Module, Name, Arity}},
-                        [{FieldName, Field,
-                          erl_types:t_from_form(Field,
-                                                ExpTypes,
-                                                Site,
-                                                TempRecords1)}
-                         || {FieldName, Field, _} <- Fields]
+                        {Fields1, C7} =
+                          lists:mapfoldl(fun({FieldName, Field, _}, C5) ->
+                                             {FieldT, C6} =
+                                               erl_types:t_from_form
+                                                 (Field, ExpTypes, Site,
+                                                  TempRecords1, VarTable,
+                                                  C5),
+                                          {{FieldName, Field, FieldT}, C6}
+                                      end, C4, Fields),
+                        {{Arity, Fields1}, C7}
                     end,
                   {FileLine, Fields} = Value,
-                  {FileLine, orddict:map(FieldFun, Fields)};
-                _Other -> Value
+                  {FieldsList, C3} =
+                    lists:mapfoldl(FieldFun, C2, orddict:to_list(Fields)),
+                  {{Key, {FileLine, orddict:from_list(FieldsList)}}, C3};
+                _Other -> {{Key, Value}, C2}
               end
           end,
-	dict:map(RecordFun, Record)
+        {RecordList, C1} =
+          lists:mapfoldl(RecordFun, C0, dict:to_list(Record)),
+        {{Module, dict:from_list(RecordList)}, C1}
     end,
-  NewRecords = dict:map(ModuleFun, TempRecords1),
-  ok = check_record_fields(NewRecords, ExpTypes),
+  {NewRecordsList, C1} =
+    lists:mapfoldl(ModuleFun, Cache1, dict:to_list(TempRecords1)),
+  NewRecords = dict:from_list(NewRecordsList),
+  _C8 = check_record_fields(NewRecords, ExpTypes, C1),
   dialyzer_codeserver:finalize_records(NewRecords, CServer).
 
 %% erl_types:t_from_form() substitutes the declaration of opaque types
 %% for the expanded type in some cases. To make sure the initial type,
 %% any(), is not used, the expansion is done twice.
 %% XXX: Recursive opaque types are not handled well.
-process_opaque_types0(TempRecords0, TempExpTypes) ->
-  TempRecords1 = process_opaque_types(TempRecords0, TempExpTypes),
-  process_opaque_types(TempRecords1, TempExpTypes).
+process_opaque_types0(TempRecords0, TempExpTypes, Cache) ->
+  {TempRecords1, NewCache} =
+    process_opaque_types(TempRecords0, TempExpTypes, Cache),
+  process_opaque_types(TempRecords1, TempExpTypes, NewCache).
 
-process_opaque_types(TempRecords, TempExpTypes) ->
+process_opaque_types(TempRecords, TempExpTypes, Cache) ->
+  VarTable = erl_types:var_table__new(),
   ModuleFun =
-    fun(Module, Record) ->
+    fun({Module, Record}, C0) ->
         RecordFun =
-          fun(Key, Value) ->
+          fun({Key, Value}, C2) ->
               case Key of
                 {opaque, Name, NArgs} ->
                   {{_Module, _FileLine, Form, _ArgNames}=F, _Type} = Value,
                   Site = {type, {Module, Name, NArgs}},
-                  Type = erl_types:t_from_form(Form, TempExpTypes, Site,
-                                               TempRecords),
-                  {F, Type};
-                _Other -> Value
+                  {Type, C3} =
+                    erl_types:t_from_form(Form, TempExpTypes, Site,
+                                          TempRecords, VarTable, C2),
+                  {{Key, {F, Type}}, C3};
+                _Other -> {{Key, Value}, C2}
               end
           end,
-	dict:map(RecordFun, Record)
+        {RecordList, C1} =
+          lists:mapfoldl(RecordFun, C0, dict:to_list(Record)),
+        {{Module, dict:from_list(RecordList)}, C1}
+        %% dict:map(RecordFun, Record)
     end,
-  dict:map(ModuleFun, TempRecords).
+  {TempRecordList, NewCache} =
+    lists:mapfoldl(ModuleFun, Cache, dict:to_list(TempRecords)),
+  {dict:from_list(TempRecordList), NewCache}.
+  %% dict:map(ModuleFun, TempRecords).
 
-check_record_fields(Records, TempExpTypes) ->
+check_record_fields(Records, TempExpTypes, Cache) ->
+  VarTable = erl_types:var_table__new(),
   CheckFun =
-    fun({Module, Element}) ->
-        CheckForm = fun(Form, Site) ->
-                      erl_types:t_check_record_fields(Form, TempExpTypes,
-                                                      Site, Records)
+    fun({Module, Element}, C0) ->
+        CheckForm = fun(Form, Site, C1) ->
+                        erl_types:t_check_record_fields(Form, TempExpTypes,
+                                                        Site, Records,
+                                                        VarTable, C1)
                   end,
         ElemFun =
-          fun({Key, Value}) ->
+          fun({Key, Value}, C2) ->
               case Key of
                 {record, Name} ->
                   FieldFun =
-                    fun({Arity, Fields}) ->
+                    fun({Arity, Fields}, C3) ->
                         Site = {record, {Module, Name, Arity}},
-                        _ = [ok = CheckForm(Field, Site) ||
-                              {_, Field, _} <- Fields],
-                        ok
+                        lists:foldl(fun({_, Field, _}, C4) ->
+                                        CheckForm(Field, Site, C4)
+                                    end, C3, Fields)
                     end,
                   {FileLine, Fields} = Value,
-                  Fun = fun() -> lists:foreach(FieldFun, Fields) end,
+                  Fun = fun() -> lists:foldl(FieldFun, C2, Fields) end,
                   msg_with_position(Fun, FileLine);
                 {_OpaqueOrType, Name, NArgs} ->
                   Site = {type, {Module, Name, NArgs}},
                   {{_Module, FileLine, Form, _ArgNames}, _Type} = Value,
-                  Fun = fun() -> ok = CheckForm(Form, Site) end,
+                  Fun = fun() -> CheckForm(Form, Site, C2) end,
                   msg_with_position(Fun, FileLine)
               end
           end,
-        lists:foreach(ElemFun, dict:to_list(Element))
+        lists:foldl(ElemFun, C0, dict:to_list(Element))
     end,
-  lists:foreach(CheckFun, dict:to_list(Records)).
+  lists:foldl(CheckFun, Cache, dict:to_list(Records)).
 
 msg_with_position(Fun, FileLine) ->
   try Fun()
@@ -396,7 +424,7 @@ msg_with_position(Fun, FileLine) ->
       throw({error, NewMsg})
   end.
 
--spec merge_records(dict:dict(), dict:dict()) -> dict:dict().
+-spec merge_records(mod_records(), mod_records()) -> mod_records().
 
 merge_records(NewRecords, OldRecords) ->
   dict:merge(fun(_Key, NewVal, _OldVal) -> NewVal end, NewRecords, OldRecords).
@@ -410,7 +438,7 @@ merge_records(NewRecords, OldRecords) ->
 -type spec_dict()     :: dict:dict().
 -type callback_dict() :: dict:dict().
 
--spec get_spec_info(module(), abstract_code(), dict:dict()) ->
+-spec get_spec_info(module(), abstract_code(), type_table()) ->
         {'ok', spec_dict(), callback_dict()} | {'error', string()}.
 
 get_spec_info(ModName, AbstractCode, RecordsDict) ->
@@ -676,7 +704,7 @@ format_errors([]) ->
 format_sig(Type) ->
   format_sig(Type, dict:new()).
 
--spec format_sig(erl_types:erl_type(), dict:dict()) -> string().
+-spec format_sig(erl_types:erl_type(), type_table()) -> string().
 
 format_sig(Type, RecDict) ->
   "fun(" ++ Sig = lists:flatten(erl_types:t_to_string(Type, RecDict)),
diff --git a/lib/dialyzer/test/unmatched_returns_SUITE_data/src/send.erl b/lib/dialyzer/test/unmatched_returns_SUITE_data/src/send.erl
new file mode 100644
index 0000000000..4d681b5cc7
--- /dev/null
+++ b/lib/dialyzer/test/unmatched_returns_SUITE_data/src/send.erl
@@ -0,0 +1,11 @@
+-module(send).
+
+-export([s/0]).
+
+s() ->
+    self() ! n(), % no warning
+    erlang:send(self(), n()), % no warning
+    ok.
+
+n() ->
+    {1, 1}.