Upgrade toolchain and fix test

rust-toolchain.toml

@@ -2,5 +2,5 @@
 # SPDX-License-Identifier: Apache-2.0 OR MIT
 
 [toolchain]
-channel = "nightly-2023-10-10"
+channel = "nightly-2023-10-16"
 components = ["llvm-tools-preview", "rustc-dev", "rust-src", "rustfmt"]

tests/coverage/unreachable/contradiction/expected

@@ -1,6 +1,7 @@
 coverage/unreachable/contradiction/main.rs, 5, FULL
 coverage/unreachable/contradiction/main.rs, 6, FULL
-coverage/unreachable/contradiction/main.rs, 7, PARTIAL
-coverage/unreachable/contradiction/main.rs, 8, NONE
-coverage/unreachable/contradiction/main.rs, 11, FULL
-coverage/unreachable/contradiction/main.rs, 13, FULL
+coverage/unreachable/contradiction/main.rs, 7, FULL
+coverage/unreachable/contradiction/main.rs, 8, PARTIAL
+coverage/unreachable/contradiction/main.rs, 9, NONE
+coverage/unreachable/contradiction/main.rs, 12, FULL
+coverage/unreachable/contradiction/main.rs, 14, FULL

tests/coverage/unreachable/contradiction/main.rs

@@ -3,9 +3,10 @@
 #[kani::proof]
 fn contradiction() {
  let x: u8 = kani::any();
+ let mut y: u8 = 0;
  if x > 5 {
  if x < 2 {
- let y = x;
+ y = x;
  }
  } else {
  assert!(x < 10);