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-rw-r--r--lib/compiler/src/sys_core_fold.erl15
-rw-r--r--lib/compiler/test/lc_SUITE.erl11
2 files changed, 22 insertions, 4 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index 7d1819ea15..2618f7adba 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -2288,10 +2288,17 @@ opt_simple_let_2(Let0, Vs0, Arg0, Body, Ctxt, Sub) ->
%% No variables left.
Body;
{_,Arg,#c_literal{}} ->
- %% Since the variable is not used in the body, we can rewrite the
- %% let to a sequence:
- %% let <Var> = Arg in Literal ==> seq Arg Literal
- expr(#c_seq{arg=Arg,body=Body}, Ctxt, sub_new_preserve_types(Sub));
+ E = case Ctxt of
+ effect ->
+ %% Throw away the literal body.
+ Arg;
+ value ->
+ %% Since the variable is not used in the body, we
+ %% can rewrite the let to a sequence.
+ %% let <Var> = Arg in Literal ==> seq Arg Literal
+ #c_seq{arg=Arg,body=Body}
+ end,
+ expr(E, Ctxt, sub_new_preserve_types(Sub));
{Vs,Arg,Body} ->
%% If none of the variables are used in the body, we can
%% rewrite the let to a sequence:
diff --git a/lib/compiler/test/lc_SUITE.erl b/lib/compiler/test/lc_SUITE.erl
index 6c5b34498b..62bada1407 100644
--- a/lib/compiler/test/lc_SUITE.erl
+++ b/lib/compiler/test/lc_SUITE.erl
@@ -208,6 +208,17 @@ effect(Config) when is_list(Config) ->
#{<<1:500>>:=V1,<<2:301>>:=V2} <- L],
ok
end, id([#{},x,#{<<1:500>>=>42,<<2:301>>=>{a,b,c}}])),
+
+ %% Will trigger the time-trap timeout if not tail-recursive.
+ case ?MODULE of
+ lc_SUITE ->
+ _ = [{'EXIT',{badarg,_}} =
+ (catch binary_to_atom(<<C/utf8>>, utf8)) ||
+ C <- lists:seq(16#10000, 16#FFFFF)];
+ _ ->
+ ok
+ end,
+
ok.
do_effect(Lc, L) ->