You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: fixed.rs
    path of file: ./repos/c2rust/c2rust-analyze/tests/filecheck
    
    the code of the file until where you have to start completion: use std::ptr;

// CHECK-LABEL: final labeling for "func"
// Ref-typed function arguments and results should be marked `FIXED`.
// CHECK: ([[@LINE+2]]: &'a u8): {{.*}}, type flags = FIXED#&u8[{{.*}}]
// CHECK: ([[@LINE+1]]: x): {{.*}}, type flags = FIXED#&&u8[
    
unsafe fn func<'a>(x: &'a &'a u8) -> &'a u8 {
    // Locals declared as ref type should be marked `FIXED`
    // CHECK: ([[@LINE+1]]: y): {{.*}}, type flags = FIXED#&u8[{{.*}}]
    let y: &u8 = *x;

    // Locals inferred as ref type should be marked `FIXED`
    // CHECK: ([[@LINE+1]]: y): {{.*}}, type flags = FIXED#&u8[{{.*}}]
    let y = *x;

    // Locals inferred as non-refs should not marked `FIXED`, and neither should temporary refs.
    // CHECK: ([[@LINE+2]]: y): {{.*}}, type flags = (empty)#*const u8[{{.*}}]
    // CHECK: ([[@LINE+1]]: &**x): {{.*}}, type flags = (empty)#&u8[{{.*}}]
    let y = &**x as *const u8;

    // CHECK: ([[@LINE+1]]: &*y): {{.*}}, type flags = (empty)#&u8[{{.*}}]
    &*y
}