Initial release candidate

.cargo/config

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+# Templated by `cargo-generate` using https://github.com/danielhenrymantilla/proc-macro-template
+[alias]
+docs-rs = [
+    "doc", "--no-deps", "--open",
+    "--features", "docs-rs",
+]
+
+[build]
+rustdocflags = [
+    "--html-before-content", "fix-docsrs-li-details-summary.html",
+]
+
+[doc.extern-map.registries]
+crates-io = "https://docs.rs/"
+
+[profile.rust-analyzer]
+inherits = "dev"

.github/workflows/CI.yml

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+name: CI
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  # == CHECK == #
+  check:
+    name: "Check beta stable and MSRV=1.65.0"
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust-toolchain:
+          - 1.65.0
+          - stable
+          # Try to guard against a near-future regression.
+          - beta
+        cargo-locked: ['', '--locked']
+        feature-nightly-dropck_eyepatch: ['', '--features nightly-dropck_eyepatch']
+        exclude:
+          # MSRV guarantee only stands for `.lock`-tested dependencies.
+          - rust-toolchain: 1.65.0
+            cargo-locked: ''
+    steps:
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust-toolchain }}
+          override: true
+
+      - name: Clone repo
+        uses: actions/checkout@v2
+
+      - name: Update `Cargo.lock`
+        if: matrix.cargo-locked != '--locked'
+        run: cargo update -v
+
+      - name: Cargo check
+        uses: actions-rs/cargo@v1
+        env:
+          RUSTC_BOOTSTRAP: 1
+        with:
+          command: check
+          args: ${{ matrix.cargo-locked }} ${{ matrix.feature-nightly-dropck_eyepatch }}
+
+  # == BUILD & TEST == #
+  build-and-test:
+    name: Build and test
+    runs-on: ${{ matrix.os }}
+    needs: []
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+        rust-toolchain:
+          - 1.65.0
+          - stable
+    steps:
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: default
+          override: true
+          toolchain: ${{ matrix.rust-toolchain }}
+
+      - name: Clone repo
+        uses: actions/checkout@v2
+
+      - name: cargo test --lib --tests
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --lib --tests
+
+      - name: cargo test --doc
+        if: matrix.rust-toolchain == 'stable'
+        uses: actions-rs/cargo@v1
+        env:
+          RUSTC_BOOTSTRAP: 1
+        with:
+          command: test
+          args: --features better-docs --doc
+
+  required-jobs:
+      needs:
+        - check
+        - build-and-test
+      runs-on: ubuntu-latest
+      if: ${{ always() }}
+      steps:
+        - name: 'All required jobs'
+          run: |
+            RESULT=$(echo "${{ join(needs.*.result, '') }}" | sed -e "s/success//g")
+            if [ -n "$RESULT" ]; then
+              echo "❌"
+              false
+            fi
+            echo "✅"

.github/workflows/future-proof.yml

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+# Templated by `cargo-generate` using https://github.com/danielhenrymantilla/proc-macro-template
+name: Cron CI
+
+on:
+  push:
+    branches:
+      - master
+  schedule:
+    - cron: '0 8 * * 1,5'
+
+jobs:
+  # == TEST == #
+  test-no-ui:
+    name: (Check & Build &) Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+        rust-toolchain:
+          # Future-proof against compiler-regressions
+          - beta
+          - nightly
+        cargo-locked: ['--locked']
+        feature-nightly-dropck_eyepatch: ['', '--features nightly-dropck_eyepatch']
+        include:
+          # Also future-proof against semver breakage from dependencies.
+          - rust-toolchain: stable
+            cargo-locked: ''
+    steps:
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: default
+          override: true
+          toolchain: ${{ matrix.rust-toolchain }}
+
+      - name: Clone repo
+        uses: actions/checkout@v2
+
+      - name: Update `Cargo.lock`
+        if: matrix.cargo-locked != '--locked'
+        run: cargo update -v
+
+      - name: Cargo test
+        uses: actions-rs/cargo@v1
+        env:
+          RUSTC_BOOTSTRAP: 1
+        with:
+          command: test
+          args: |
+            --features better-docs
+            ${{ matrix.cargo-locked }}
+            ${{ matrix.feature-nightly-dropck_eyepatch }}

.gitignore

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+# Templated by `cargo-generate` using https://github.com/danielhenrymantilla/proc-macro-template
+/target

Cargo.toml

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+# Templated by `cargo-generate` using https://github.com/danielhenrymantilla/proc-macro-template
+[package]
+name = "maybe-dangling"
+authors = [
+    "Daniel Henry-Mantilla <[email protected]>",
+]
+version = "0.1.0-rc1"  # Keep in sync
+edition = "2021"
+rust-version = "1.65.0"
+
+license = "Zlib OR MIT OR Apache-2.0"
+repository = "https://github.com/danielhenrymantilla/maybe-dangling.rs"
+documentation = "https://docs.rs/maybe-dangling"
+readme = "README.md"
+
+description = "`ManuallyDrop<T>` and `MaybeDangling<T>` semantics in stable Rust as per https://github.com/rust-lang/rfcs/pull/3336"
+keywords = ["unsafe", "dangling", "aliasing", "dereferenceable", "manuallydrop"]
+
+[features]
+default = [
+]
+
+# Enable and use `#![feature(dropck_eyepatch)]` for `MaybeDangling`.
+nightly-dropck_eyepatch = []
+
+# unstable! Will probably use nightly to improve doc quality
+better-docs = []
+
+ui-tests = [
+    "better-docs",
+]
+
+# `docs-rs` is very similar to `better-docs`, but for it being allowed to enable
+# other features as well, often to make sure optional/non-`default` features
+# make it to the rendered docs (using `--all-features` instead is not that great).
+docs-rs = [
+    "better-docs",
+]
+
+[dependencies]
+
+[dev-dependencies]
+
+[workspace]
+
+[package.metadata.docs.rs]
+features = [
+    "docs-rs",
+]
+rustdoc-args = [
+    # Use (with or without `open`):
+    # ```md
+    # <details open class="custom"><summary><span class="summary-box"><span>Click to hide</span></span></summary>
+    # …
+    # </details>
+    # ```
+    # to get nice drop-down menus (and avoid the css bug with rustdoc).
+    "--html-before-content", "fix-docsrs-li-details-summary.html",
+]