diff options
Diffstat (limited to 'lib/compiler')
| -rw-r--r-- | lib/compiler/src/sys_core_fold.erl | 15 | ||||
| -rw-r--r-- | lib/compiler/test/lc_SUITE.erl | 11 |
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) -> |