Hi Sergey, thank you for the patch. As I understood from the comments there are no actual issues blocked in the exclusions for which the new issue should be created and commented into the code, if so, then LGTM.

  
>Среда, 8 апреля 2020, 18:43 +03:00 от Sergey Bronnikov <estetus@gmail.com>:
> 
>From: Sergey Bronnikov < sergeyb@tarantool.org >
>
>From the beginning we haven't use static analysis for Lua source code and
>therefore now we have about 32k warnings and errors produced by luacheck. Sure
>these issues are not real bugs but fixing them will make source code better and
>clear. Aim to fix all of them at once looks insane and perhaps it is not worth
>it.
>
>Summary of static analysis:
>
>There were no errors found by luacheck in production source code (src/),
>many warnings were fixed in previous commits and non-interested warnings were
>supressed using luacheck config.
>
>Lua source code in test/ directory contains both errors and warnings and there
>are a lot of them. Some of these warnings were fixed by previous commits and
>most part of warnings and errors supressed in luacheck config. Regarding
>errors: all found errors belongs to a single error class - "Syntax error"
>(E011). All of them have a single root cause - at the of testscases we write
>conditions without assignments and it is confuses luacheck. Usually such
>conditions used together with asserts, but in our tests we uses reference outputs
>instead of asserts.
>
>How-to check:
>
>$ tarantoolctl rocks install luacheck
>$ .rocks/bin/luacheck --codes --config .luacheckrc .
>
>Closes #4681
>---
> .luacheckrc | 162 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 162 insertions(+)
> create mode 100644 .luacheckrc
>
>diff --git a/.luacheckrc b/.luacheckrc
>new file mode 100644
>index 000000000..2550f9f1a
>--- /dev/null
>+++ b/.luacheckrc
>@@ -0,0 +1,162 @@
>+include_files = {
>+ "**/*.lua",
>+ "extra/dist/tarantoolctl.in",
>+}
>+
>+exclude_files = {
>+ "third_party/**/*.lua",
>+ "test-run/**/*.lua",
>+ "test/wal_off/*.lua", -- E011
>+ "test/xlog/*.lua", -- E011
>+ "test/vinyl/*.lua", -- E011
>+ "test/sql/*.lua", -- E011
>+ "test/replication/*.lua", -- E011
>+ "test/engine/*.lua", -- E011
>+ "test/swim/*.lua", -- E011
>+ "test/box/*.lua", -- E011
>+ "test/app/*.lua", -- E011
>+ "test/app-tap/*.lua", -- E011
>+ "test/app-tap/lua/serializer_test.lua", -- E011
>+ "build/**/*.lua",
>+ ".rocks/**/*.lua",
>+ ".git/**/*.lua",
>+}
>+
>+files["**/*.lua"] = {ignore = {"212", "122"}}
>+files["extra/dist/tarantoolctl.in"] = {ignore = {"431", "411", "122", "542"}}
>+files["src/lua/help.lua"] = {globals = {"help", "tutorial"}, ignore = {"113", "211"}}
>+files["src/lua/swim.lua"] = {ignore = {"431"}}
>+files["src/lua/fio.lua"] = {ignore = {"231"}}
>+files["src/lua/init.lua"] = {ignore = {"122", "121"}}
>+files["src/lua/fiber.lua"] = {ignore = {"331", "311"}}
>+files["src/box/lua/serpent.lua"] = {globals = {"_ENV"}, ignore = {"431", "421", "631", "432", "542", "412", "422"}}
>+files["src/box/lua/load_cfg.lua"] = {ignore = {"431", "143", "311", "542"}}
>+files["src/box/lua/net_box.lua"] = {ignore = {"431", "211", "421", "432", "311", "231", "411", "412"}}
>+files["src/box/lua/schema.lua"] = {globals = {"update_format", "iid", "role_check_grant_revoke_of_sys_priv"}, ignore = {"431", "122", "211", "421", "213", "432", "311", "542", "412"}}
>+files["src/box/lua/key_def.lua"] = {ignore = {"431"}}
>+files["src/box/lua/feedback_daemon.lua"] = {ignore = {"122", "211"}}
>+files["src/box/lua/tuple.lua"] = {ignore = {"122", "211", "421", "412"}}
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>+files["src/box/lua/console.lua"] = {globals = {"help"}, ignore = {"211", "143"}}
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>+files["test/app/*.lua"] = {ignore = {"111", "113"}}
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>+files["test/app-tap/lua/require_mod.lua"] = {ignore = {"113", "111"}}
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>+files["test/box/lua/fifo.lua"] = {ignore = {"113", "213"}}
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>+files["test/box/lua/require_init.lua"] = {ignore = {"412", "143"}}
>+files["test/box/lua/test_init.lua"] = {ignore = {"113", "412", "143"}}
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>+files["test/box-tap/auth.test.lua"] = {ignore = {"311", "411", "113"}}
>+files["test/box-tap/cfg.test.lua"] = {ignore = {"311", "411", "113"}}
>+files["test/box-tap/cfgup.test.lua"] = {ignore = {"113"}}
>+files["test/box-tap/feedback_daemon.test.lua"] = {ignore = {"411"}}
>+files["test/box-tap/gc.test.lua"] = {ignore = {"421"}}
>+files["test/box-tap/on_schema_init.test.lua"] = {ignore = {"113"}}
>+files["test/box-tap/schema_mt.test.lua"] = {ignore = {"113", "122"}}
>+files["test/box-tap/key_def.test.lua"] = {ignore = {"411", "431"}}
>+files["test/box-tap/merger.test.lua"] = {ignore = {"411", "431", "412", "213"}}
>+files["test/box-tap/session.storage.test.lua"] = {ignore = {"113"}}
>+files["test/box-tap/session.test.lua"] = {ignore = {"411", "113", "412", "143"}}
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>+files["test/box-tap/trigger_yield.test.lua"] = {ignore = {"213", "113"}}
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>+files["test/luajit-tap/gh-4476-fix-string-find-recording.test.lua"] = {ignore = {"231"}}
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>+files["test/luajit-tap/gh.test.lua"] = {ignore = {"111", "113"}}
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>+files["test/luajit-tap/unsink_64_kptr.test.lua"] = {ignore = {"111", "113", "551", "542"}}
>+files["test/luajit-tap/or-232-unsink-64-kptr.test.lua"] = {ignore = {"542"}}
>+files["test/luajit-tap/lj-494-table-chain-infinite-loop.test.lua"] = {ignore = {"111", "113", "213"}}
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>+files["test/engine_long/suite.lua"] = {ignore = {"421", "111", "213"}}
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>+files["test/long_run-py/lua/finalizers.lua"] = {ignore = {"241", "511", "111", "113"}}
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>+files["test/replication/lua/rlimit.lua"] = {ignore = {"113", "111"}}
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>+files["test/sql/triggers.test.lua"] = {ignore = {"631", "113", "111"}}
>+files["test/sql/tokenizer.test.lua"] = {ignore = {"113", "111"}}
>+files["test/sql/transitive-transactions.test.lua"] = {ignore = {"113", "111"}}
>+files["test/sql/savepoints.test.lua"] = {ignore = {"113", "111"}}
>+files["test/sql/persistency.test.lua"] = {ignore = {"113", "111"}}
>+files["test/sql-tap/*.lua"] = {ignore = {"113", "111"}}
>+files["test/sql-tap/lua_sql.test.lua"] = {ignore = {"412"}}
>+files["test/sql-tap/subquery.test.lua"] = {ignore = {"412", "143"}}
>+files["test/sql-tap/alias.test.lua"] = {ignore = {"412", "143"}}
>+files["test/sql-tap/analyze9.test.lua"] = {ignore = {"213", "411"}}
>+files["test/sql-tap/between.test.lua"] = {ignore = {"421", "213"}}
>+files["test/sql-tap/check.test.lua"] = {ignore = {"412", "143"}}
>+files["test/sql-tap/date.test.lua"] = {ignore = {"511"}}
>+files["test/sql-tap/e_expr.test.lua"] = {ignore = {"512", "431", "213", "411"}}
>+files["test/sql-tap/func.test.lua"] = {ignore = {"412", "143"}}
>+files["test/sql-tap/func5.test.lua"] = {ignore = {"412", "143"}}
>+files["test/sql-tap/misc1.test.lua"] = {ignore = {"411"}}
>+files["test/sql-tap/select1.test.lua"] = {ignore = {"511", "213"}}
>+files["test/sql-tap/select2.test.lua"] = {ignore = {"421"}}
>+files["test/sql-tap/select4.test.lua"] = {ignore = {"421"}}
>+files["test/sql-tap/select5.test.lua"] = {ignore = {"421"}}
>+files["test/sql-tap/selectA.test.lua"] = {ignore = {"542"}}
>+files["test/sql-tap/selectB.test.lua"] = {ignore = {"213", "542"}}
>+files["test/sql-tap/selectG.test.lua"] = {ignore = {"421"}}
>+files["test/sql-tap/table.test.lua"] = {ignore = {"511"}}
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>+files["test/swim/box.lua"] = {ignore = {"113", "111"}}
>--
>2.23.0
>  
 
 
--
Alexander Tikhonov