update to Rust 1.93

Dockerfile

@@ -1,5 +1,5 @@
 # always build this using the latest stable release
-FROM rust:1.88.0 AS build-base
+FROM rust:1.93.0 AS build-base
 
 ARG JQ_VERSION=1.6
 ARG JQ_URL=https://github.com/stedolan/jq/releases/download/jq-${JQ_VERSION}/jq-linux64
@@ -48,51 +48,84 @@ 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/stable/bookworm/slim/Dockerfile
+# https://github.com/rust-lang/docker-rust/blob/master/stable/trixie/slim/Dockerfile
 
 ################ start-copy-pasta ################
 
-FROM debian:bookworm-slim
+FROM debian:trixie-slim
+
+LABEL org.opencontainers.image.source=https://github.com/rust-lang/docker-rust
 
 ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \
     PATH=/usr/local/cargo/bin:$PATH \
-    RUST_VERSION=nightly-2025-06-28
+    RUST_VERSION=nightly-2026-01-22
 #                ~~~~~~~~^~~~~~~~~~
 #                 pin version here
 
 RUN set -eux; \
+    \
     apt-get update; \
     apt-get install -y --no-install-recommends \
         ca-certificates \
         gcc \
         libc6-dev \
         wget \
         ; \
-    dpkgArch="$(dpkg --print-architecture)"; \
-    case "${dpkgArch##*-}" in \
-        amd64) rustArch='x86_64-unknown-linux-gnu'; rustupSha256='20a06e644b0d9bd2fbdbfd52d42540bdde820ea7df86e92e533c073da0cdd43c' ;; \
-        armhf) rustArch='armv7-unknown-linux-gnueabihf'; rustupSha256='3b8daab6cc3135f2cd4b12919559e6adaee73a2fbefb830fadf0405c20231d61' ;; \
-        arm64) rustArch='aarch64-unknown-linux-gnu'; rustupSha256='e3853c5a252fca15252d07cb23a1bdd9377a8c6f3efa01531109281ae47f841c' ;; \
-        i386) rustArch='i686-unknown-linux-gnu'; rustupSha256='a5db2c4b29d23e9b318b955dd0337d6b52e93933608469085c924e0d05b1df1f' ;; \
-        ppc64el) rustArch='powerpc64le-unknown-linux-gnu'; rustupSha256='acd89c42b47c93bd4266163a7b05d3f26287d5148413c0d47b2e8a7aa67c9dc0' ;; \
-        s390x) rustArch='s390x-unknown-linux-gnu'; rustupSha256='726b7fd5d8805e73eab4a024a2889f8859d5a44e36041abac0a2436a52d42572' ;; \
-        *) echo >&2 "unsupported architecture: ${dpkgArch}"; exit 1 ;; \
+    \
+    arch="$(dpkg --print-architecture)"; \
+    case "$arch" in \
+        'amd64') \
+            rustArch='x86_64-unknown-linux-gnu'; \
+            rustupSha256='20a06e644b0d9bd2fbdbfd52d42540bdde820ea7df86e92e533c073da0cdd43c'; \
+            ;; \
+        'armhf') \
+            rustArch='armv7-unknown-linux-gnueabihf'; \
+            rustupSha256='3b8daab6cc3135f2cd4b12919559e6adaee73a2fbefb830fadf0405c20231d61'; \
+            ;; \
+        'arm64') \
+            rustArch='aarch64-unknown-linux-gnu'; \
+            rustupSha256='e3853c5a252fca15252d07cb23a1bdd9377a8c6f3efa01531109281ae47f841c'; \
+            ;; \
+        'i386') \
+            rustArch='i686-unknown-linux-gnu'; \
+            rustupSha256='a5db2c4b29d23e9b318b955dd0337d6b52e93933608469085c924e0d05b1df1f'; \
+            ;; \
+        'ppc64el') \
+            rustArch='powerpc64le-unknown-linux-gnu'; \
+            rustupSha256='acd89c42b47c93bd4266163a7b05d3f26287d5148413c0d47b2e8a7aa67c9dc0'; \
+            ;; \
+        's390x') \
+            rustArch='s390x-unknown-linux-gnu'; \
+            rustupSha256='726b7fd5d8805e73eab4a024a2889f8859d5a44e36041abac0a2436a52d42572'; \
+            ;; \
+        'riscv64') \
+            rustArch='riscv64gc-unknown-linux-gnu'; \
+            rustupSha256='09e64cc1b7a3e99adaa15dd2d46a3aad9d44d71041e2a96100d165c98a8fd7a7'; \
+            ;; \
+        *) \
+            echo >&2 "unsupported architecture: $arch"; \
+            exit 1; \
+            ;; \
     esac; \
+    \
     url="https://static.rust-lang.org/rustup/archive/1.28.2/${rustArch}/rustup-init"; \
-    wget "$url"; \
+    wget --progress=dot:giga "$url"; \
     echo "${rustupSha256} *rustup-init" | sha256sum -c -; \
+    \
     chmod +x rustup-init; \
     ./rustup-init -y --no-modify-path --profile minimal --default-toolchain $RUST_VERSION --default-host ${rustArch}; \
     rm rustup-init; \
     chmod -R a+w $RUSTUP_HOME $CARGO_HOME; \
-    rustup --version; \
-    cargo --version; \
-    rustc --version; \
+    \
     apt-get remove -y --auto-remove \
         wget \
         ; \
-    rm -rf /var/lib/apt/lists/*;
+    rm -rf /var/lib/apt/lists/*; \
+    \
+    rustup --version; \
+    cargo --version; \
+    rustc --version;
 
 ################ end-copy-pasta ################
 

src/lib.rs

@@ -69,6 +69,7 @@ where
             }
         }
     }
+    out.tests.sort();
     out
 }
 

src/output.rs

@@ -1,4 +1,7 @@
+use std::sync::LazyLock;
+
 use crate::test_name_formatter::format_test_name;
+use regex::Regex;
 use serde::{Deserialize, Serialize};
 
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
@@ -19,6 +22,9 @@ pub struct TestResult {
     pub output: Option<String>,
 }
 
+static THREAD_PANICKED_REGEX: LazyLock<Regex> =
+    LazyLock::new(|| Regex::new(r"thread '(?<testname>.*)' \(.*\) panicked at").unwrap());
+
 impl TestResult {
     pub fn ok(name: String, test_code: String) -> TestResult {
         TestResult {
@@ -40,16 +46,19 @@ impl TestResult {
             _ => (None, message.map(|m| m.trim_start().to_owned())),
         };
 
-        // This note is attached to the error message of only one test case that fails,
-        // but not always the same one. To avoid CI failing unnecessarily, this note
-        // is stripped from all messages.
-        // It's also not useful to students reading the output of the test runner,
-        // as they can't set this environment variable in the test runner themselves.
         let message = message.map(|m| {
-            m.trim_end_matches(
+            // This note is attached to the error message of only one test case that fails,
+            // but not always the same one. To avoid CI failing unnecessarily, this note
+            // is stripped from all messages.
+            // It's also not useful to students reading the output of the test runner,
+            // as they can't set this environment variable in the test runner themselves.
+            let m = m.trim_end_matches(
                 "note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace\n",
-            )
-            .to_owned()
+            );
+            // If the test panics, the message contains a thread number that's
+            // not deterministic. Strip it to improve test reliability.
+            let m = THREAD_PANICKED_REGEX.replace(m, "thread '$testname' panicked at");
+            m.to_string()
         });
 
         TestResult {
@@ -62,6 +71,22 @@ impl TestResult {
     }
 }
 
+impl PartialOrd for TestResult {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for TestResult {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        match self.name.cmp(&other.name) {
+            core::cmp::Ordering::Equal => {}
+            ord => return ord,
+        }
+        self.test_code.cmp(&other.test_code)
+    }
+}
+
 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Output {
     pub version: u8,