CI: Surface Rust warnings on PRs that touch any Rust code

Idea is, if you create PRs touching Rust code often, you probably don't
mind being shown new warnings introduced in new Rust releases. They've
been trivial to fix and this will help us stay on top of them.

Fix a typo for demo

Author: XrXr

.github/workflows/rust-lints-on-prs.yml

@@ -0,0 +1,50 @@
+# Surface Rust warnings on PRs that touch any Rust code
+name: Show Rust warnings on PR
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    paths:
+      - '**.rs'
+      - '!**.inc.rs'
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
+  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
+
+permissions:
+  contents: read
+
+jobs:
+  make:
+    env:
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+
+    runs-on: ubuntu-24.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.head_commit.message, 'Document')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.title, 'Document')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: ./.github/actions/setup/directories
+
+      - name: Install Rust
+        run: rustup default beta
+
+      - name: Gather and translate warnings
+        run: |
+          set -euo pipefail
+          cargo check --all-features --message-format=json |
+          jq -r 'select(.reason == "compiler-message" and .message.level == "warning") |
+                 "::warning file=\(.message.spans[0].file_name),line=\(.message.spans[0].line_start),endLine=\(.message.spans[0].line_end)::\(
+                 .message.rendered | gsub("%"; "%25") | gsub("\n"; "%0A") | gsub("\r"; "%0D"))"'

zjit/src/hir.rs

@@ -343,7 +343,7 @@ impl<'a> std::fmt::Display for ConstPrinter<'a> {
 ///
 /// Because this is extra state external to any pointer being printed, a
 /// printing adapter struct that wraps the pointer along with this map is
-/// required to make use of this effectly. The [`std::fmt::Display`]
+/// required to make use of this effectively. The [`std::fmt::Display`]
 /// implementation on the adapter struct can then be reused to implement
 /// `Display` on the inner type with a default [`PtrPrintMap`], which
 /// does not perform any mapping.