Upgrade Rust toolchain to 2025-11-16 (#4477)

Relevant upstream PR:
- rust-lang/rust#148789 (New format_args!() and
fmt::Arguments implementation)

Resolves: #4474

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 and MIT licenses.

Author: tautschnig

rust-toolchain.toml

@@ -2,5 +2,5 @@
 # SPDX-License-Identifier: Apache-2.0 OR MIT
 
 [toolchain]
-channel = "nightly-2025-11-13"
+channel = "nightly-2025-11-17"
 components = ["llvm-tools", "rustc-dev", "rust-src", "rustfmt"]

tests/coverage/known_issues/variant/expected

@@ -1,30 +1,30 @@
    1|     | // Copyright Kani Contributors\
    2|     | // SPDX-License-Identifier: Apache-2.0 OR MIT\
-   3|     | \
+   3|     |\
    4|     | //! Checks coverage results in an example with a `match` statement matching on\
    5|     | //! all enum variants. Currently, it does not yield the expected results because\
    6|     | //! it reports the `dir` in the match statement as `UNCOVERED`:\
    7|     | //! <https://github.com/model-checking/kani/issues/3456>\
-   8|     | \
+   8|     |\
    9|     | enum Direction {\
   10|     |     Up,\
   11|     |     Down,\
   12|     |     Left,\
   13|     |     Right,\
   14|     | }\
-  15|     | \
+  15|     |\
   16|    1| fn print_direction(dir: Direction) {\
   17|     |     // For some reason, `dir`'s span is reported as `UNCOVERED` too\
   18|    0|     match ```dir''' {\
-  19|    0|         Direction::Up => ```println!("Going up!"'''),\
-  20|    0|         Direction::Down => ```println!("Going down!"'''),\
+  19|    0|         Direction::Up => ```println!'''("Going up!"),\
+  20|    0|         Direction::Down => ```println!'''("Going down!"),\
   21|    1|         Direction::Left => println!("Going left!"),\
-  22|    0|         Direction::Right if 1 == ```1 => println!("Going right!"'''),\
+  22|    0|         Direction::Right if 1 == ```1 => println!'''("Going right!"),\
   23|     |         // This part is unreachable since we cover all variants in the match.\
-  24|    0|         _ => ```println!("Not going anywhere!"'''),\
+  24|    0|         _ => ```println!'''("Not going anywhere!"),\
   25|     |     }\
   26|     | }\
-  27|     | \
+  27|     |\
   28|     | #[kani::proof]\
   29|    1| fn main() {\
   30|    1|     let direction = Direction::Left;\

tests/expected/function-contract/modifies/zst_pass.expected

@@ -1,5 +1,4 @@
-.assertion\
+__CPROVER_contracts_\
 - Status: SUCCESS\
-- Description: "ptr NULL or writable up to size"\
 
 VERIFICATION:- SUCCESSFUL

tests/expected/panic/arg-error/test.rs

@@ -5,7 +5,7 @@
 //! This test checks that Kani processes arguments of panic macros and produces
 //! a compile error for invalid arguments (e.g. missing argument)
 
-const fn my_const_fn(msg: &str) -> ! {
+fn my_const_fn(msg: &str) -> ! {
     core::panic!("{}")
 }