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-rw-r--r--lib/compiler/src/core_lint.erl2
-rw-r--r--lib/compiler/src/sys_core_fold.erl7
-rw-r--r--lib/compiler/test/Makefile1
-rw-r--r--lib/compiler/test/core_fold_SUITE.erl44
-rw-r--r--lib/compiler/test/unused_multiple_values_error.core11
5 files changed, 61 insertions, 4 deletions
diff --git a/lib/compiler/src/core_lint.erl b/lib/compiler/src/core_lint.erl
index 8b688df830..1e8983f594 100644
--- a/lib/compiler/src/core_lint.erl
+++ b/lib/compiler/src/core_lint.erl
@@ -309,7 +309,7 @@ expr(#c_fun{vars=Vs,body=B}, Def, Rt, St0) ->
{Vvs,St1} = variable_list(Vs, St0),
return_match(Rt, 1, body(B, union(Vvs, Def), any, St1));
expr(#c_seq{arg=Arg,body=B}, Def, Rt, St0) ->
- St1 = expr(Arg, Def, any, St0), %Ignore values
+ St1 = expr(Arg, Def, 1, St0),
body(B, Def, Rt, St1);
expr(#c_let{vars=Vs,arg=Arg,body=B}, Def, Rt, St0) ->
St1 = body(Arg, Def, let_varcount(Vs), St0), %This is a body
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index 07b054c5d7..cda3f7d81e 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -132,7 +132,12 @@ body(Body, Sub) ->
body(#c_values{anno=A,es=Es0}, Ctxt, Sub) ->
Es1 = expr_list(Es0, Ctxt, Sub),
- #c_values{anno=A,es=Es1};
+ case Ctxt of
+ value ->
+ #c_values{anno=A,es=Es1};
+ effect ->
+ make_effect_seq(Es1, Sub)
+ end;
body(E, Ctxt, Sub) ->
?ASSERT(verify_scope(E, Sub)),
expr(E, Ctxt, Sub).
diff --git a/lib/compiler/test/Makefile b/lib/compiler/test/Makefile
index b9c5be09ce..51b3064589 100644
--- a/lib/compiler/test/Makefile
+++ b/lib/compiler/test/Makefile
@@ -75,6 +75,7 @@ INLINE= \
CORE_MODULES = \
bs_shadowed_size_var \
+ unused_multiple_values_error \
nested_call_in_case
diff --git a/lib/compiler/test/core_fold_SUITE.erl b/lib/compiler/test/core_fold_SUITE.erl
index c2a592f699..abc9ab6a72 100644
--- a/lib/compiler/test/core_fold_SUITE.erl
+++ b/lib/compiler/test/core_fold_SUITE.erl
@@ -21,7 +21,8 @@
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_group/2,end_per_group/2,
t_element/1,setelement/1,t_length/1,append/1,t_apply/1,bifs/1,
- eq/1,nested_call_in_case/1,guard_try_catch/1,coverage/1]).
+ eq/1,nested_call_in_case/1,guard_try_catch/1,coverage/1,
+ unused_multiple_values_error/1,unused_multiple_values/1]).
-export([foo/0,foo/1,foo/2,foo/3]).
@@ -36,7 +37,8 @@ all() ->
groups() ->
[{p,test_lib:parallel(),
[t_element,setelement,t_length,append,t_apply,bifs,
- eq,nested_call_in_case,guard_try_catch,coverage]}].
+ eq,nested_call_in_case,guard_try_catch,coverage,
+ unused_multiple_values_error,unused_multiple_values]}].
init_per_suite(Config) ->
@@ -289,3 +291,41 @@ cover_is_safe_bool_expr(X) ->
end.
id(I) -> I.
+
+unused_multiple_values_error(Config) when is_list(Config) ->
+ PrivDir = ?config(priv_dir, Config),
+ Dir = filename:dirname(code:which(?MODULE)),
+ Core = filename:join(Dir, "unused_multiple_values_error"),
+ Opts = [no_copt,clint,return,from_core,{outdir,PrivDir}
+ |test_lib:opt_opts(?MODULE)],
+ {error,[{unused_multiple_values_error,
+ [{core_lint,{return_mismatch,{hello,1}}}]}],
+ []} = c:c(Core, Opts),
+ ok.
+
+unused_multiple_values(Config) when is_list(Config) ->
+ put(unused_multiple_values, []),
+ [false] = test_unused_multiple_values(false),
+ [b,a,{a,b},false] = test_unused_multiple_values({a,b}),
+ ok.
+
+test_unused_multiple_values(X) ->
+ ok = do_unused_multiple_values(X),
+ get(unused_multiple_values).
+
+do_unused_multiple_values(X) ->
+ case do_something(X) of
+ false ->
+ A = false;
+ Res ->
+ {A,B} = Res,
+ do_something(A),
+ do_something(B)
+ end,
+ _ThisShouldNotFail = A,
+ ok.
+
+do_something(I) ->
+ put(unused_multiple_values,
+ [I|get(unused_multiple_values)]),
+ I.
diff --git a/lib/compiler/test/unused_multiple_values_error.core b/lib/compiler/test/unused_multiple_values_error.core
new file mode 100644
index 0000000000..e06587c936
--- /dev/null
+++ b/lib/compiler/test/unused_multiple_values_error.core
@@ -0,0 +1,11 @@
+module 'unused_multiple_values_error' ['hello'/1]
+ attributes []
+'hello'/1 =
+ fun (_cor0) ->
+ do
+ case _cor0 of
+ <_cor0> when 'true' ->
+ <'ok','ok'>
+ end
+ 'ok'
+end