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mrustc (master)
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pub fn main() { // <-- First scope, let's call it 'a let a : i32 = 42; let illegal_borrow; { // <-- Another scope, let's call it 'b // We borrow a, which lives in the scope 'a. This information gets encoded // within the TYPE of borrow_a. The full type is: // &'a i32 let borrow_a = &a; // Let's do the same thing again, but this time for a variable that lives // in the scope 'b! let b = 43; // The type of illegal_borrow is: // &'b i32 illegal_borrow = &b; } // Rust knows AT COMPILE TIME that using illegal_borrow from the scope 'a // is not allowed, because the lifetime 'b has expired! println!("{}", *illegal_borrow); }
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