diff options
Diffstat (limited to 'lib/stdlib/src')
| -rw-r--r-- | lib/stdlib/src/erl_lint.erl | 30 |
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) -> |