[Tarantool-patches] [PATCH luajit] test: adapt test checking global environment

[Maxim Kokryashkin via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

LuaJIT doesn't take into account tail calls for
call-level counting, so `getfenv()` behaviour is different
in tail calls. getfenv()` default level is 1 which is invalid for
the test case when is called from tail call (`lj_debug_frame()`
returns NULL).

This commits adds local varible, so there is no tail call any more.

Closes tarantool/tarantool#5713
Part of tarantool/tarantool#5845
Part of tarantool/tarantool#4473
---
Issue: https://github.com/tarantool/tarantool/issues/5713
GitHub branch: https://github.com/tarantool/luajit/tree/fckxorg/gh-5713-adapt-test-global-environment-PUC-Rio

 test/PUC-Rio-Lua-5.1-tests/closure.lua | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/test/PUC-Rio-Lua-5.1-tests/closure.lua b/test/PUC-Rio-Lua-5.1-tests/closure.lua
index 551fe70d..c0377179 100644
--- a/test/PUC-Rio-Lua-5.1-tests/closure.lua
+++ b/test/PUC-Rio-Lua-5.1-tests/closure.lua
@@ -167,22 +167,24 @@ local function foo (a)
   assert(getfenv(0) == a)
   assert(getfenv(1) == _G)
   assert(getfenv(loadstring"") == a)
-  return getfenv()
+  local env = getfenv()
+  return env
 end
 
 f = coroutine.wrap(foo)
 local a = {}
 assert(f(a) == _G)
 local a,b = pcall(f)
--- FIXME: LuaJIT doesn't take into account tail calls for
+-- LuaJIT doesn't take into account tail calls for
 -- call-level counting, so `getfenv()` behaviour is different
 -- in tail calls. For example, this `pcall()` returns false,
 -- because `getfenv()` default level is 1 which is invalid for
 -- this case when is called from tail call (`lj_debug_frame()`
 -- returns NULL).
 -- See also https://github.com/tarantool/tarantool/issues/5713.
--- Test is disabled for LuaJIT for now.
--- assert(a and b == _G)
+
+-- Test is adapted to the behavior LuaJIT.
+assert(a and b == _G)
 
 
 -- tests for multiple yield/resume arguments
-- 
2.33.0