At least in Lua then the rule is simply 'last thing a function dose' this is unambiguous. `return f()` is always a tail call and `return f() + 1` never is.
At least in Lua then the rule is simply 'last thing a function dose' this is unambiguous. `return f()` is always a tail call and `return f() + 1` never is.
What about:
return 1 + f()
?
No, the last thing is the +; which can't run till it knows both values. (Reverse Polish notation is clearer, but humans prefer infix operators for some reason)