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_Noreturnkeyword since C11, but it's one of the few languages that do.Nothingtype, which can be used for exactly this.Nothingreturn type, telling you that the code will never be reached. Unfortunately, this is not checked at compile time.Nothing(in Kotlin) is actually much better then you guys say!Nothingrepresents a value that has 0 instances. Therefore, if a function returns Nothing, it must never return. There are two main standard library functions that return Nothing:exitProcessandthrow(though, throw is not a function but a language intrinsic). This means that you can usethrowin a function and the compiler can use it to do more complex flow analysis. For example, doingif(x == null) throw new Exc("x is null")can be replaced byif(x==null) error("x is null"assumingerrorreturnsNothing.!for some obscure reason.