Ref Extended

Extends lifetime of reference to same as lifetime of value by shortening entire program lifetime

When it is useful?

1. You are doing programming without heap allocation (such as embed programming), and don't want to use static.
2. You run some diverging functions which exit process itself without returning.

Example

let mut a = 2_i32; // The lifetime of value itself(not reference) is 'static
ref_extended!(&mut a); // Extends lifetime of reference to lifetime of value ('static)

// This compiles
identity::<&'static i32>(a);

// Process abort if function containing this extended reference try to return or panic