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kotlinlang

is your `=` super thin in in the screenshot or are those `-` ?
and i am not sure if its a proper replacement but there is StringBuffer too
and StringBuilder should still exist.. maybe your gradle setup is incorrect or just broken during switch to 1.2

<@UBBFK40RZ> thanks for responding! Those are = signs. StringBuffer is chiefly meant for multithreaded environments, so I was hoping to use the single threaded variant. 

I received a notification in intellij to upgrade to the latest kotlin sdk and restart, which I did. I don't have a Grade build file at all, not that I explicitly created anyhow. This is just a plain Kotlin project created in intellij. There's probably some lingering classpath or other issue from the Kotlin upgrade. The same code worked on my other system, so this is likely a config issue. I'll keep digging, but if something else strikes you as odd based on the screenshot, do let me know! 

`StringBuilder` is from `java.lang` Maybe you made your project a non-JVM project?