Fix infinite loop

[gogonzo]

closes insightsengineering/teal#1474

Problem happens when two or more symbols occur in the same time on rhs and lhs. Due to this, l depends on class and class depends on l.

  code <- "l <- list(a = 1, b = 2)
    class(l) <- c('new class', class(l))" # l depends on class and class depends on l
  q <- eval_code(qenv(), code)
  get_code(q, names = "l")

@donyunardi This was a serious bug and will require a new release. We can wait a little to the day when teal is going to be submitted to CRAN.

[github-actions]

Unit Tests Summary

  1 files   12 suites   3s ⏱️
152 tests 149 ✅ 3 💤 0 ❌
232 runs  229 ✅ 3 💤 0 ❌

Results for commit 5cb2a95.

♻️ This comment has been updated with latest results.

[github-actions]

Unit Test Performance Difference

Additional test case details

Test Suite	$Status$	Time on main	$±Time$	Test Case
qenv_get_code	👶		$+0.02$	extracting_code_doesn_t_fail_when_lhs_contains_two_or_more_symbols_occurring_in_rhs

Results for commit fcc1af1

♻️ This comment has been updated with latest results.

[m7pr]

well done @gogonzo

thanks @chlebowa for raising