> I'm playing around with this in the compiler explorer and I'm now even more confused why you want this.
It works with RAII to create a temporally isolated resource scope, think context managers / using / try-with-resource; it provides a scratch space where you limit collisions with the rest of the function and avoid the risk of mis-reuse of those values; and before non-lexical lifetimes it was critical to limit borrow durations. It's also routinely used in combination with closures, to prepare their capture. Similar to C++ capture clauses, but without special syntax.
It's essentially a micro-namespace inside the function.
It works with RAII to create a temporally isolated resource scope, think context managers / using / try-with-resource; it provides a scratch space where you limit collisions with the rest of the function and avoid the risk of mis-reuse of those values; and before non-lexical lifetimes it was critical to limit borrow durations. It's also routinely used in combination with closures, to prepare their capture. Similar to C++ capture clauses, but without special syntax.
It's essentially a micro-namespace inside the function.