From 37fd07e1e7eacfd21b429d4fa642b3581b61240b Mon Sep 17 00:00:00 2001
From: Stephan Boyer <stephan@stephanboyer.com>
Date: Sun, 2 Nov 2025 17:49:40 -0800
Subject: [PATCH] Update Rust to v1.91.0

---
 .github/workflows/ci.yml | 12 ++++++------
 src/run.rs               | 19 +++++++++----------
 toast.yml                | 12 ++++++------
 3 files changed, 21 insertions(+), 22 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 00f76cd..dd471dd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -90,8 +90,8 @@ jobs:
         #   https://github.com/rust-lang/rustup/issues/2441
         #
         # for more information.
-        rustup toolchain install 1.88.0 --no-self-update # [ref:rust_1.88.0]
-        rustup default 1.88.0 # [ref:rust_1.88.0]
+        rustup toolchain install 1.91.0 --no-self-update # [ref:rust_1.91.0]
+        rustup default 1.91.0 # [ref:rust_1.91.0]
 
         # Add the targets.
         rustup target add x86_64-pc-windows-msvc
@@ -131,8 +131,8 @@ jobs:
         set -euxo pipefail
 
         # Install the appropriate version of Rust.
-        rustup toolchain install 1.88.0 # [ref:rust_1.88.0]
-        rustup default 1.88.0 # [ref:rust_1.88.0]
+        rustup toolchain install 1.91.0 # [ref:rust_1.91.0]
+        rustup default 1.91.0 # [ref:rust_1.91.0]
 
         # Add the targets.
         rustup target add x86_64-apple-darwin
@@ -213,8 +213,8 @@ jobs:
         set -euxo pipefail
 
         # Install the appropriate version of Rust.
-        rustup toolchain install 1.88.0 # [ref:rust_1.88.0]
-        rustup default 1.88.0 # [ref:rust_1.88.0]
+        rustup toolchain install 1.91.0 # [ref:rust_1.91.0]
+        rustup default 1.91.0 # [ref:rust_1.91.0]
 
         # Fetch the program version.
         VERSION="$(cargo pkgid | cut -d# -f2 | cut -d: -f2)"
diff --git a/src/run.rs b/src/run.rs
index 02d92bc..dad32af 100644
--- a/src/run.rs
+++ b/src/run.rs
@@ -603,16 +603,15 @@ fn construct_polyforest(
         let mut new_frontier = HashSet::new();
 
         for image_id in frontier {
-            if let Some(image_node) = polyforest.get(&image_id).cloned() {
-                if let Some(parent_id) = &image_node.image_record.parent_id {
-                    if let Some(parent_node) = polyforest.get_mut(parent_id) {
-                        parent_node.last_used_since_epoch = max(
-                            parent_node.last_used_since_epoch,
-                            image_node.last_used_since_epoch,
-                        );
-                        new_frontier.insert(parent_id.clone());
-                    }
-                }
+            if let Some(image_node) = polyforest.get(&image_id).cloned()
+                && let Some(parent_id) = &image_node.image_record.parent_id
+                && let Some(parent_node) = polyforest.get_mut(parent_id)
+            {
+                parent_node.last_used_since_epoch = max(
+                    parent_node.last_used_since_epoch,
+                    image_node.last_used_since_epoch,
+                );
+                new_frontier.insert(parent_id.clone());
             }
         }
 
diff --git a/toast.yml b/toast.yml
index c1c38e7..803e367 100644
--- a/toast.yml
+++ b/toast.yml
@@ -17,11 +17,11 @@ command_prefix: |
   cargo-offline () { cargo --frozen --offline "$@"; }
 
   # Use this wrapper for formatting code or checking that code is formatted. We use a nightly Rust
-  # version for the `trailing_comma` formatting option [tag:rust_fmt_nightly_2025-07-06]. The
+  # version for the `trailing_comma` formatting option [tag:rust_fmt_nightly_2025-11-02]. The
   # nightly version was chosen as the latest available release with all components present
   # according to this page:
   #   https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu.html
-  cargo-fmt () { cargo +nightly-2025-07-06 --frozen --offline fmt --all -- "$@"; }
+  cargo-fmt () { cargo +nightly-2025-11-02 --frozen --offline fmt --all -- "$@"; }
 
   # Make Bash log commands.
   set -x
@@ -92,18 +92,18 @@ tasks:
       - install_packages
       - create_user
     command: |
-      # Install stable Rust [tag:rust_1.88.0].
+      # Install stable Rust [tag:rust_1.91.0].
       curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- \
         -y \
-        --default-toolchain 1.88.0 \
+        --default-toolchain 1.91.0 \
         --profile minimal \
         --component clippy
 
       # Add Rust tools to `$PATH`.
       . "$HOME/.cargo/env"
 
-      # Install nightly Rust [ref:rust_fmt_nightly_2025-07-06].
-      rustup toolchain install nightly-2025-07-06 --profile minimal --component rustfmt
+      # Install nightly Rust [ref:rust_fmt_nightly_2025-11-02].
+      rustup toolchain install nightly-2025-11-02 --profile minimal --component rustfmt
 
   install_tools:
     description: Install the tools needed to build and validate the program.