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Introduce C++ style constexpr modifier. In short, functions marked with constexpr are verified by compiler to satisfy certain strict rules and they can be used as a part of constant expressions and assigned to const val properties with their values evaluated in compile-time. The goals of this change are: * Documentation, discoverability, and language learning-curve reduction * Language consistency for novices (especially coming from non-Java world) * Language extensibility The rollout of constexpr shall be phased. Phase 1. "Documentation Phase" The most pressing and immediate need is not about user-defined constexprs at all, but to document stdlib functions that are currently allowed to be used in constant expressions. For example, this is non-trivial Kotlin behavior for a novice Kotlin user: const val x = 1.toByte() // OK const val y = "1".toByte() // ERROR: Const 'val' initializer should be a constant value It is not the message itself that is puzzling, but the fact that you can Ctrl+Click to definition of…