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-rw-r--r--erts/doc/src/absform.xml2
-rw-r--r--lib/stdlib/src/erl_parse.yrl36
-rw-r--r--lib/stdlib/test/erl_lint_SUITE.erl53
-rw-r--r--lib/stdlib/test/erl_pp_SUITE.erl13
4 files changed, 80 insertions, 24 deletions
diff --git a/erts/doc/src/absform.xml b/erts/doc/src/absform.xml
index ab00d47425..fe8e3b30e7 100644
--- a/erts/doc/src/absform.xml
+++ b/erts/doc/src/absform.xml
@@ -886,7 +886,7 @@
Rep(Fc) = <c>[Rep(C_1), ..., Rep(C_k)]</c>.</p>
<list type="bulleted">
- <item>If C is a constraint <c>is_subtype(V, T)</c> or <c>V :: T</c>,
+ <item>If C is a constraint <c>V :: T</c>,
where <c>V</c> is a type variable
and <c>T</c> is a type, then Rep(C) =
<c>{type,LINE,constraint,[{atom,LINE,is_subtype},[Rep(V),Rep(T)]]}</c>.
diff --git a/lib/stdlib/src/erl_parse.yrl b/lib/stdlib/src/erl_parse.yrl
index 91d1372a63..922455a6f2 100644
--- a/lib/stdlib/src/erl_parse.yrl
+++ b/lib/stdlib/src/erl_parse.yrl
@@ -33,7 +33,6 @@ list tail
list_comprehension lc_expr lc_exprs
binary_comprehension
tuple
-%struct
record_expr record_tuple record_field record_fields
map_expr map_tuple map_field map_field_assoc map_field_exact map_fields map_key
if_expr if_clause if_clauses case_expr cr_clause cr_clauses receive_expr
@@ -108,9 +107,8 @@ type_sig -> fun_type 'when' type_guards : {type, ?anno('$1'), bounded_fun,
type_guards -> type_guard : ['$1'].
type_guards -> type_guard ',' type_guards : ['$1'|'$3'].
-type_guard -> atom '(' top_types ')' : {type, ?anno('$1'), constraint,
- ['$1', '$3']}.
-type_guard -> var '::' top_type : build_def('$1', '$3').
+type_guard -> atom '(' top_types ')' : build_compat_constraint('$1', '$3').
+type_guard -> var '::' top_type : build_constraint('$1', '$3').
top_types -> top_type : ['$1'].
top_types -> top_type ',' top_types : ['$1'|'$3'].
@@ -269,7 +267,6 @@ expr_max -> binary : '$1'.
expr_max -> list_comprehension : '$1'.
expr_max -> binary_comprehension : '$1'.
expr_max -> tuple : '$1'.
-%%expr_max -> struct : '$1'.
expr_max -> '(' expr ')' : '$2'.
expr_max -> 'begin' exprs 'end' : {block,?anno('$1'),'$2'}.
expr_max -> if_expr : '$1'.
@@ -328,10 +325,6 @@ lc_expr -> binary '<=' expr : {b_generate,?anno('$2'),'$1','$3'}.
tuple -> '{' '}' : {tuple,?anno('$1'),[]}.
tuple -> '{' exprs '}' : {tuple,?anno('$1'),'$2'}.
-
-%%struct -> atom tuple :
-%% {struct,?anno('$1'),element(3, '$1'),element(3, '$2')}.
-
map_expr -> '#' map_tuple :
{map, ?anno('$1'),'$2'}.
map_expr -> expr_max '#' map_tuple :
@@ -1057,13 +1050,13 @@ build_typed_attribute({atom,Aa,Attr},_) ->
end.
build_type_spec({Kind,Aa}, {SpecFun, TypeSpecs})
- when (Kind =:= spec) or (Kind =:= callback) ->
+ when Kind =:= spec ; Kind =:= callback ->
NewSpecFun =
case SpecFun of
{atom, _, Fun} ->
{Fun, find_arity_from_specs(TypeSpecs)};
- {{atom,_, Mod}, {atom,_, Fun}} ->
- {Mod,Fun,find_arity_from_specs(TypeSpecs)}
+ {{atom, _, Mod}, {atom, _, Fun}} ->
+ {Mod, Fun, find_arity_from_specs(TypeSpecs)}
end,
{attribute,Aa,Kind,{NewSpecFun, TypeSpecs}}.
@@ -1077,11 +1070,24 @@ find_arity_from_specs([Spec|_]) ->
{type, _, 'fun', [{type, _, product, Args},_]} = Fun,
length(Args).
-build_def({var, A, '_'}, _Types) ->
+%% The 'is_subtype(V, T)' syntax is not supported as of Erlang/OTP
+%% 19.0, but is kept for backward compatibility.
+build_compat_constraint({atom, _, is_subtype}, [{var, _, _}=LHS, Type]) ->
+ build_constraint(LHS, Type);
+build_compat_constraint({atom, _, is_subtype}, [LHS, _Type]) ->
+ ret_err(?anno(LHS), "bad type variable");
+build_compat_constraint({atom, A, Atom}, _Types) ->
+ ret_err(A, io_lib:format("unsupported constraint ~w", [Atom])).
+
+build_constraint({atom, _, is_subtype}, [{var, _, _}=LHS, Type]) ->
+ build_constraint(LHS, Type);
+build_constraint({atom, A, Atom}, _Foo) ->
+ ret_err(A, io_lib:format("unsupported constraint ~w", [Atom]));
+build_constraint({var, A, '_'}, _Types) ->
ret_err(A, "bad type variable");
-build_def(LHS, Types) ->
+build_constraint(LHS, Type) ->
IsSubType = {atom, ?anno(LHS), is_subtype},
- {type, ?anno(LHS), constraint, [IsSubType, [LHS, Types]]}.
+ {type, ?anno(LHS), constraint, [IsSubType, [LHS, Type]]}.
lift_unions(T1, {type, _Aa, union, List}) ->
{type, ?anno(T1), union, [T1|List]};
diff --git a/lib/stdlib/test/erl_lint_SUITE.erl b/lib/stdlib/test/erl_lint_SUITE.erl
index c86e17f70c..c90f855b3b 100644
--- a/lib/stdlib/test/erl_lint_SUITE.erl
+++ b/lib/stdlib/test/erl_lint_SUITE.erl
@@ -64,7 +64,7 @@
predef/1,
maps/1,maps_type/1,maps_parallel_match/1,
otp_11851/1,otp_11879/1,otp_13230/1,
- record_errors/1]).
+ record_errors/1, otp_xxxxx/1]).
suite() ->
[{ct_hooks,[ts_install_cth]},
@@ -84,7 +84,7 @@ all() ->
too_many_arguments, basic_errors, bin_syntax_errors, predef,
maps, maps_type, maps_parallel_match,
otp_11851, otp_11879, otp_13230,
- record_errors].
+ record_errors, otp_xxxxx].
groups() ->
[{unused_vars_warn, [],
@@ -3869,6 +3869,55 @@ record_errors(Config) when is_list(Config) ->
{3,erl_lint,{redefine_field,r,a}}],[]}}],
run(Config, Ts).
+otp_xxxxx(Config) ->
+ Ts = [{constraint1,
+ <<"-export([t/1]).
+ -spec t(X) -> X when is_subtype(integer()).
+ t(a) -> foo:bar().
+ ">>,
+ [],
+ {errors,
+ [{2,erl_parse,"unsupported constraint " ++ ["is_subtype"]}],
+ []}},
+ {constraint2,
+ <<"-export([t/1]).
+ -spec t(X) -> X when bad_atom(X, integer()).
+ t(a) -> foo:bar().
+ ">>,
+ [],
+ {errors,
+ [{2,erl_parse,"unsupported constraint " ++ ["bad_atom"]}],
+ []}},
+ {constraint3,
+ <<"-export([t/1]).
+ -spec t(X) -> X when is_subtype(bad_variable, integer()).
+ t(a) -> foo:bar().
+ ">>,
+ [],
+ {errors,[{2,erl_parse,"bad type variable"}],[]}},
+ {constraint4,
+ <<"-export([t/1]).
+ -spec t(X) -> X when is_subtype(atom(), integer()).
+ t(a) -> foo:bar().
+ ">>,
+ [],
+ {errors,[{2,erl_parse,"bad type variable"}],[]}},
+ {constraint5,
+ <<"-export([t/1]).
+ -spec t(X) -> X when is_subtype(X, integer()).
+ t(a) -> foo:bar().
+ ">>,
+ [],
+ []},
+ {constraint6,
+ <<"-export([t/1]).
+ -spec t(X) -> X when X :: integer().
+ t(a) -> foo:bar().
+ ">>,
+ [],
+ []}],
+ run(Config, Ts).
+
run(Config, Tests) ->
F = fun({N,P,Ws,E}, BadL) ->
case catch run_test(Config, P, Ws) of
diff --git a/lib/stdlib/test/erl_pp_SUITE.erl b/lib/stdlib/test/erl_pp_SUITE.erl
index 13c5662741..31ea3210a8 100644
--- a/lib/stdlib/test/erl_pp_SUITE.erl
+++ b/lib/stdlib/test/erl_pp_SUITE.erl
@@ -825,12 +825,13 @@ type_examples() ->
%% is_subtype(V, T) syntax, we need a few examples of the syntax.
{ex31,<<"-spec t1(FooBar :: t99()) -> t99();"
"(t2()) -> t2();"
- "('\\'t::4'()) -> '\\'t::4'() when is_subtype('\\'t::4'(), t24);"
- "(t23()) -> t23() when is_subtype(t23(), atom()),"
- " is_subtype(t23(), t14());"
- "(t24()) -> t24() when is_subtype(t24(), atom()),"
- " is_subtype(t24(), t14()),"
- " is_subtype(t24(), '\\'t::4'()).">>},
+ "('\\'t::4'()) -> {'\\'t::4'(), B}"
+ " when is_subtype(B, '\\'t::4'());"
+ "(t23()) -> C when is_subtype(C, atom()),"
+ " is_subtype(C, t14());"
+ "(t24()) -> D when is_subtype(D, atom()),"
+ " is_subtype(D, t14()),"
+ " is_subtype(D, '\\'t::4'()).">>},
{ex32,<<"-spec mod:t2() -> any(). ">>},
{ex33,<<"-opaque attributes_data() :: "
"[{'column', column()} | {'line', info_line()} |"
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-08 23:04:49 +0000