{"action":"created","comment":{"url":"https://api.github.com/repos/code-dot-org/code-dot-org/pulls/comments/39880133","id":39880133,"diff_hunk":"@@ -44,6 +44,7 @@ exports.TestResults = {\n \n   // start using negative values, since we consider >= 20 to be \"solved\"\n   EMPTY_FUNCTION_NAME: -1,       // We have a variable or function with the name \"\"\n+  NESTED_FOR_SAME_VARIABLE: -2,","path":"apps/src/constants.js","position":4,"original_position":4,"commit_id":"1135f6f2dbcd4226819eb7caf07b2e7913a5ca13","original_commit_id":"1135f6f2dbcd4226819eb7caf07b2e7913a5ca13","user":{"login":"Bjvanminnen","id":1767466,"avatar_url":"https://avatars.githubusercontent.com/u/1767466?v=3","gravatar_id":"","url":"https://api.github.com/users/Bjvanminnen","html_url":"https://github.com/Bjvanminnen","followers_url":"https://api.github.com/users/Bjvanminnen/followers","following_url":"https://api.github.com/users/Bjvanminnen/following{/other_user}","gists_url":"https://api.github.com/users/Bjvanminnen/gists{/gist_id}","starred_url":"https://api.github.com/users/Bjvanminnen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Bjvanminnen/subscriptions","organizations_url":"https://api.github.com/users/Bjvanminnen/orgs","repos_url":"https://api.github.com/users/Bjvanminnen/repos","events_url":"https://api.github.com/users/Bjvanminnen/events{/privacy}","received_events_url":"https://api.github.com/users/Bjvanminnen/received_events","type":"User","site_admin":false},"body":"I didn't actually validate, but I assume so. The danger might be if we somehow end up in a case where we end up with NO_TESTS_RUN and give an error message about EMPTY_FUNCTION_NAME. Not sure how big a risk this is/if it makes sense to change at this point. What do you think?","created_at":"2015-09-18T17:32:07Z","updated_at":"2015-09-18T17:32:07Z","html_url":"https://github.com/code-dot-org/code-dot-org/pull/4044#discussion_r39880133","pull_request_url":"https://api.github.com/repos/code-dot-org/code-dot-org/pulls/4044","_links":{"self":{"href":"https://api.github.com/repos/code-dot-org/code-dot-org/pulls/comments/39880133"},"html":{"href":"https://github.com/code-dot-org/code-dot-org/pull/4044#discussion_r39880133"},"pull_request":{"href":"https://api.github.com/repos/code-dot-org/code-dot-org/pulls/4044"}}},"pull_request":{"url":"https://api.github.com/repos/code-dot-org/code-dot-org/pulls/4044","id":45429315,"html_url":"https://github.com/code-dot-org/code-dot-org/pull/4044","diff_url":"https://github.com/code-dot-org/code-dot-org/pull/4044.diff","patch_url":"https://github.com/code-dot-org/code-dot-org/pull/4044.patch","issue_url":"https://api.github.com/repos/code-dot-org/code-dot-org/issues/4044","number":4044,"state":"open","locked":false,"title":"[Finishes #99829750] Detect nested for loops using same variable name","user":{"login":"Bjvanminnen","id":1767466,"avatar_url":"https://avatars.githubusercontent.com/u/1767466?v=3","gravatar_id":"","url":"https://api.github.com/users/Bjvanminnen","html_url":"https://github.com/Bjvanminnen","followers_url":"https://api.github.com/users/Bjvanminnen/followers","following_url":"https://api.github.com/users/Bjvanminnen/following{/other_user}","gists_url":"https://api.github.com/users/Bjvanminnen/gists{/gist_id}","starred_url":"https://api.github.com/users/Bjvanminnen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Bjvanminnen/subscriptions","organizations_url":"https://api.github.com/users/Bjvanminnen/orgs","repos_url":"https://api.github.com/users/Bjvanminnen/repos","events_url":"https://api.github.com/users/Bjvanminnen/events{/privacy}","received_events_url":"https://api.github.com/users/Bjvanminnen/received_events","type":"User","site_admin":false},"body":"This is trying to solve the problem where we have two nested loops using the same variable. If we execute that code, it will loop infinitely. We take two approaches here:\r\n(1) Try to detect this case and display an error\r\n![image](https://cloud.githubusercontent.com/assets/1767466/9965592/fefa65de-5deb-11e5-9a5c-05a267cab5e6.png)\r\n(2) Make it harder to get into this case by providing a for loop block that avoids duplicate variable names. Doing this requires manually editing the xml:\r\n![image](https://cloud.githubusercontent.com/assets/1767466/9965666/876fccba-5dec-11e5-8785-5843b500221b.png)\r\nThe default_var is what we'll first try to call our variable. If that name is taken, we'll increment by one (i.e. counter2 instead of counter1) and look to see if that is taken. 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