jit.opt.start("hotloop=1")

local iteration = 0
local function test(value)
  iteration = iteration + 1
  --print("a") -- printing fixes wrong behavior
  local pos_c = string.find(value, "c", 1, true)
  --assert(pos_c == 3, "pos=" .. pos_c)
  --pos_c = 3 -- use of constant fixes wrong behavior
  local value2 = string.sub(value, 1, pos_c - 1)
  local pos_b = string.find(value2, "b", 2, true)
  assert(pos_b == 2, "dot1=" .. pos_b)
end

local function test_loop()
  for _ = 1, 20 do
    test("abc")
  end
end

test("abc")

local _, err = pcall(test_loop)
print(iteration)
print(err or "ok")