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Is there a way I can run IntelliJ from `master` with the Kotlin FIR plugin?  I'd like to investigate and maybe PR a completion issue I'm having (on the old FE, but there's not much point in fixing it there)

Hi Ryan! FIR Plugin is under active development now, and a lot of things may not work as expected. <https://github.com/JetBrains/intellij-community/blob/kt-212-master/plugins/kotlin/docs/fir-ide/development-process/environment-setup.md|Here is the instruction> how to build the FIR IDE from sources locally.
Note, that the branch you need in `intellij` project is `kt-212-master`, not `master`

Some useful links for you:
• <https://github.com/JetBrains/intellij-community/tree/kt-212-master/plugins/kotlin/fir/src/org/jetbrains/kotlin/idea/completion|FIR IDE plugin completion sources>
• <https://github.com/JetBrains/intellij-community/tree/kt-212-master/plugins/kotlin/fir/test/org/jetbrains/kotlin/idea/fir/completion|FIR IDE plugin completion tests>
• <https://github.com/JetBrains/kotlin/tree/master/docs/analysis/analysis-api|Analysis API (API to analyse Kotlin code) documentation >
 I will be happy to help, If you have any questions :slightly_smiling_face: