This is correct. @tailrec will simply cause a compile failure if the compiler DOESN’T optimize the function, but the compiler does still optimize tail recursion without the annotation.
It’s a weird but helpful annotation. For example, Scala won’t optimize methods that can be overridden (non-final and public/protected), which is easy to forget. So the annotation is a nice check/confirmation that the compiler is doing what you expect.
yashap|5 years ago
It’s a weird but helpful annotation. For example, Scala won’t optimize methods that can be overridden (non-final and public/protected), which is easy to forget. So the annotation is a nice check/confirmation that the compiler is doing what you expect.