The most exciting part is at the end: Code can now use lexical scoping by default instead of dynamic scoping. The `lexical-binding’ variable lets code use lexi

The most exciting part is at the end: Code can now use lexical scoping by default instead of dynamic scoping. The `lexical-binding’ variable lets code use lexical scoping for local variables. It is typically set via file-local variables, in which case it applies to all the code in that file.