qlc.hrl causes lager to produce "Warning: a term is constructed, but never used"

[yaocl]

when I include the qlc hrl, and compile test.erl in Erlang 23.1 and lager master branch and tag 2.9.2 release it generates Warning in every lager function call

src/test.erl:9: Warning: a term is constructed, but never used

in Erlang 23.1 and lager tag 2.9.1 release, test.erl is compiled without warning.

if I remove the -include_lib("stdlib/include/qlc.hrl"). and compile test.erl again. the code is compiled without warning.

the test.erl is

-module(test).

-include_lib("stdlib/include/qlc.hrl").

%% API
-export([  test/0  ]).

test() ->
  lager:debug(""),
  ok.

[mworrell]

I also see this happening with lager 3.9.2 and qlc.

[hejin1026]

this issue had fixed on tag 3.9.2. i have this problem when i upgrade erlang 11.3 to 12.0 and use lager 3.9.1 so i search the question, and found commit on lager_transform that fixed this problem now when i use 3.9.2, this problem is gone. hope it can help you

[yaocl]

this issue had fixed on tag 3.9.2.

just tested again in tag 3.9.2 and master branch with Erlang 23.1 the issue is not fixed yet