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-rw-r--r--lib/stdlib/src/erl_lint.erl30
1 files changed, 24 insertions, 6 deletions
diff --git a/lib/stdlib/src/erl_lint.erl b/lib/stdlib/src/erl_lint.erl
index a03abfaf80..1e5f962375 100644
--- a/lib/stdlib/src/erl_lint.erl
+++ b/lib/stdlib/src/erl_lint.erl
@@ -368,6 +368,9 @@ format_error({imported_predefined_type, Name}) ->
format_error({not_exported_opaque, {TypeName, Arity}}) ->
io_lib:format("opaque type ~w~s is not exported",
[TypeName, gen_type_paren(Arity)]);
+format_error({underspecified_opaque, {TypeName, Arity}}) ->
+ io_lib:format("opaque type ~w~s is underspecified and therefore meaningless",
+ [TypeName, gen_type_paren(Arity)]);
%% --- obsolete? unused? ---
format_error({format_error, {Fmt, Args}}) ->
io_lib:format(Fmt, Args);
@@ -2570,6 +2573,12 @@ type_def(Attr, Line, TypeName, ProtoType, Args, St0) ->
Arity = length(Args),
TypePair = {TypeName, Arity},
Info = #typeinfo{attr = Attr, line = Line},
+ StoreType =
+ fun(St) ->
+ NewDefs = dict:store(TypePair, Info, TypeDefs),
+ CheckType = {type, -1, product, [ProtoType|Args]},
+ check_type(CheckType, St#lint{types=NewDefs})
+ end,
case (dict:is_key(TypePair, TypeDefs) orelse is_var_arity_type(TypeName)) of
true ->
case dict:is_key(TypePair, default_types()) of
@@ -2579,20 +2588,29 @@ type_def(Attr, Line, TypeName, ProtoType, Args, St0) ->
true ->
Warn = {new_builtin_type, TypePair},
St1 = add_warning(Line, Warn, St0),
- NewDefs = dict:store(TypePair, Info, TypeDefs),
- CheckType = {type, -1, product, [ProtoType|Args]},
- check_type(CheckType, St1#lint{types=NewDefs});
+ StoreType(St1);
false ->
add_error(Line, {builtin_type, TypePair}, St0)
end;
false -> add_error(Line, {redefine_type, TypePair}, St0)
end;
false ->
- NewDefs = dict:store(TypePair, Info, TypeDefs),
- CheckType = {type, -1, product, [ProtoType|Args]},
- check_type(CheckType, St0#lint{types=NewDefs})
+ St1 = case
+ Attr =:= opaque andalso
+ is_underspecified(ProtoType, Arity)
+ of
+ true ->
+ Warn = {underspecified_opaque, TypePair},
+ add_warning(Line, Warn, St0);
+ false -> St0
+ end,
+ StoreType(St1)
end.
+is_underspecified({type,_,term,[]}, 0) -> true;
+is_underspecified({type,_,any,[]}, 0) -> true;
+is_underspecified(_ProtType, _Arity) -> false.
+
check_type(Types, St) ->
{SeenVars, St1} = check_type(Types, dict:new(), St),
dict:fold(fun(Var, {seen_once, Line}, AccSt) ->