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You can unfreeze with a temporary borrowed pointer, because it doesn't restore the previous state:
fn main() {
let x = @mut 5;
let a = &*x;
{
let b = &*x;
}
let c = &mut *x;
}Mutable borrows aren't tracked:
fn main() {
let x = @mut 5;
let a = &mut *x;
let b = &mut *x;
let c = &*x;
}I think freezing needs to be enum Borrow { Mutable, Immutable, Nothing } with an immutable borrow failing if there was a Mutable one, and a mutable borrow failing on any freeze.
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