[lucio]

Let's imagine a syntax-sugared Go...

Every function has a hidden "err" return value

Every function has an "exceptionExit:" block, by default it does just "return err;"

After every function call, an automatic "if err != nil {goto exceptionExit}" is added.

You can add an "exception" block to a function, it replaces the default.

Now you have function level exceptions in Go just by syntax sugar, without stack unwinding and without requiring new compiler functionality, just syntax sugar.