update to rust 1.85 to support 2024 edition

Dockerfile

@@ -1,5 +1,5 @@
 # always build this using the latest stable release
-FROM rust:1.80.0 AS build-base
+FROM rust:1.85.0 AS build-base
 
 ARG JQ_VERSION=1.6
 ARG JQ_URL=https://github.com/stedolan/jq/releases/download/jq-${JQ_VERSION}/jq-linux64
@@ -48,7 +48,7 @@ RUN cargo generate-lockfile && cargo local-registry --sync Cargo.lock .
 # version tag with a nightly one, pinned to a specific date.
 
 # official Dockerfile source: 
-# https://github.com/rust-lang/docker-rust/blob/master/1.80.0/bookworm/slim/Dockerfile
+# https://github.com/rust-lang/docker-rust/blob/master/stable/bookworm/slim/Dockerfile
 
 ################ start-copy-pasta ################
 
@@ -57,7 +57,7 @@ FROM debian:bookworm-slim
 ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \
     PATH=/usr/local/cargo/bin:$PATH \
-    RUST_VERSION=nightly-2024-08-02
+    RUST_VERSION=nightly-2025-02-20
 #                ~~~~~~~~^~~~~~~~~~
 #                 pin version here
 

bin/run-tests.sh

@@ -2,7 +2,7 @@
 set -eo pipefail
 
 # Synopsis:
-# Test the test runner by running it against a predefined set of solutions 
+# Test the test runner by running it against a predefined set of solutions
 # with an expected output.
 
 # Output:

src/output.rs

@@ -33,11 +33,11 @@ impl TestResult {
     pub fn fail(name: String, test_code: String, message: Option<String>) -> TestResult {
         let name = format_test_name(name);
 
-        let (output, message) = match message.as_ref().and_then(|m| m.split_once("thread '")) {
+        let (output, message) = match message.as_ref().and_then(|m| m.split_once("\nthread '")) {
             Some((output, message)) if !output.is_empty() => {
                 (Some(output.to_owned()), Some(format!("thread '{message}")))
             }
-            _ => (None, message),
+            _ => (None, message.map(|m| m.trim_start().to_owned())),
         };
 
         // This note is attached to the error message of only one test case that fails,