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kotlinlang

Hello, It's there a way you could bring back the IDE option "Enable new type inference algorithm..." that was removed in <https://youtrack.jetbrains.com/issue/KT-37378>? maybe enabled by default, or at least `Idea` could respect the compiler flag `-XXLanguage:-NewInference` , right now it doesn't seem to be the case (Idea/AS hang with the new FE). The reason I'm bringing this up because <https://youtrack.jetbrains.com/issue/KT-41644> was reopen, we are still stuck in 1.3.71 even when our code works 1.4.x (cmd gradle), but without an IDE we can't migrate

IDEA actually respects the compiler flag `-XXLanguage:-NewInference` from Gradle after project reimport (it should be applied to all Gradle projects of course). You can verify this for example on code from <https://youtrack.jetbrains.com/issue/KT-38804>: with the flag applied it will be highlighted in red in IDEA.

And yes, sorry, there are still some performance regressions in new inference in obscure cases with a lot of generics, but as has been pointed out, it generally helps to specify types explicitly, so they don't have to be inferred.