{"action":"created","issue":{"url":"https://api.github.com/repos/dotnet/roslyn/issues/10219","repository_url":"https://api.github.com/repos/dotnet/roslyn","labels_url":"https://api.github.com/repos/dotnet/roslyn/issues/10219/labels{/name}","comments_url":"https://api.github.com/repos/dotnet/roslyn/issues/10219/comments","events_url":"https://api.github.com/repos/dotnet/roslyn/issues/10219/events","html_url":"https://github.com/dotnet/roslyn/issues/10219","id":144769093,"number":10219,"title":"[Bug] IDE not respecting feature flags","user":{"login":"WreckedAvent","id":2645770,"avatar_url":"https://avatars.githubusercontent.com/u/2645770?v=3","gravatar_id":"","url":"https://api.github.com/users/WreckedAvent","html_url":"https://github.com/WreckedAvent","followers_url":"https://api.github.com/users/WreckedAvent/followers","following_url":"https://api.github.com/users/WreckedAvent/following{/other_user}","gists_url":"https://api.github.com/users/WreckedAvent/gists{/gist_id}","starred_url":"https://api.github.com/users/WreckedAvent/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/WreckedAvent/subscriptions","organizations_url":"https://api.github.com/users/WreckedAvent/orgs","repos_url":"https://api.github.com/users/WreckedAvent/repos","events_url":"https://api.github.com/users/WreckedAvent/events{/privacy}","received_events_url":"https://api.github.com/users/WreckedAvent/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/dotnet/roslyn/labels/Area-IDE","name":"Area-IDE","color":"5319e7"},{"url":"https://api.github.com/repos/dotnet/roslyn/labels/Question","name":"Question","color":"fc2929"}],"state":"open","locked":false,"assignee":{"login":"jasonmalinowski","id":201340,"avatar_url":"https://avatars.githubusercontent.com/u/201340?v=3","gravatar_id":"","url":"https://api.github.com/users/jasonmalinowski","html_url":"https://github.com/jasonmalinowski","followers_url":"https://api.github.com/users/jasonmalinowski/followers","following_url":"https://api.github.com/users/jasonmalinowski/following{/other_user}","gists_url":"https://api.github.com/users/jasonmalinowski/gists{/gist_id}","starred_url":"https://api.github.com/users/jasonmalinowski/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jasonmalinowski/subscriptions","organizations_url":"https://api.github.com/users/jasonmalinowski/orgs","repos_url":"https://api.github.com/users/jasonmalinowski/repos","events_url":"https://api.github.com/users/jasonmalinowski/events{/privacy}","received_events_url":"https://api.github.com/users/jasonmalinowski/received_events","type":"User","site_admin":false},"milestone":null,"comments":7,"created_at":"2016-03-31T02:12:48Z","updated_at":"2016-04-01T16:46:16Z","closed_at":null,"body":"**Version Used**: \r\nVS \"15\" Preview\r\n\r\n**Steps to Reproduce**:\r\n\r\n1. Create a new C# project\r\n2. Add the feature flag `/features:patterns` to the command line arguments in the properties page\r\n3. Use any pattern matching syntax\r\n4. Error telling you to do step 2\r\n\r\n**Expected Behavior**:\r\n\r\nNo error at step 4.\r\n\r\n**Actual Behavior**:\r\n\r\n![image](https://cloud.githubusercontent.com/assets/2645770/14163300/02930650-f6c2-11e5-8621-b45d585d7581.png)\r\n\r\n**Notes**:\r\n\r\nAlso tried adding as an argument to the shortcut to launch \"15\", but that just triggered a help window describing what valid flags were available. \r\n\r\nApologies if this is not where you enable feature flags, but I can't appear to find any documentation *at all* talking about them. Kind of weird, considering it's advertised on the download page. \r\n\r\n"},"comment":{"url":"https://api.github.com/repos/dotnet/roslyn/issues/comments/204466852","html_url":"https://github.com/dotnet/roslyn/issues/10219#issuecomment-204466852","issue_url":"https://api.github.com/repos/dotnet/roslyn/issues/10219","id":204466852,"user":{"login":"WreckedAvent","id":2645770,"avatar_url":"https://avatars.githubusercontent.com/u/2645770?v=3","gravatar_id":"","url":"https://api.github.com/users/WreckedAvent","html_url":"https://github.com/WreckedAvent","followers_url":"https://api.github.com/users/WreckedAvent/followers","following_url":"https://api.github.com/users/WreckedAvent/following{/other_user}","gists_url":"https://api.github.com/users/WreckedAvent/gists{/gist_id}","starred_url":"https://api.github.com/users/WreckedAvent/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/WreckedAvent/subscriptions","organizations_url":"https://api.github.com/users/WreckedAvent/orgs","repos_url":"https://api.github.com/users/WreckedAvent/repos","events_url":"https://api.github.com/users/WreckedAvent/events{/privacy}","received_events_url":"https://api.github.com/users/WreckedAvent/received_events","type":"User","site_admin":false},"created_at":"2016-04-01T16:46:16Z","updated_at":"2016-04-01T16:46:16Z","body":"@TheGrandUser Hmm, I was able to make it work just by adding to the csproj as @jasonmalinowski indicated. Here's a screenshot of what's working for me:\r\n\r\n![image](https://cloud.githubusercontent.com/assets/2645770/14213750/a9ea555c-f807-11e5-963d-19c0b1d5d23a.png)\r\n\r\n(The IDE will complain it's not a valid element, but it will load just file)"}}