You hit "Run" after bumping your kotlin-gradle-plugin to 2.0.0 , expecting a performance boost. Instead, your build console is flooded with compilation errors. Code that has been production-stable for years is suddenly failing with "Smart cast to 'Type' is impossible" or obscure JVM target conflicts. This isn't just you, and your code didn't suddenly rot. You are encountering the strictness of the new K2 Compiler . While K2 brings massive compilation speed improvements and a unified pipeline, it also fixes long-standing bugs in the K1 compiler's control flow analysis. In short: K1 was lenient and occasionally incorrect; K2 is rigorous and strictly specification-compliant. This guide analyzes the root causes of these regressions and provides architectural fixes to get your Android or Backend project building on Kotlin 2.0. The Root Cause: Why K2 Breaks Working Code To fix the errors, you must understand the architectural shift. The K1 com...
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