Create CI workflow

.github/workflows/ci.yaml

@@ -0,0 +1,81 @@
+# based on: https://github.com/actions-rs/meta/blob/master/recipes/quickstart.md
+
+name: Continuous Integration
+on: [pull_request]
+
+jobs:
+  test:
+    name: Test Suite
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v1
+      - name: Install toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      - name: Test with all features
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --all --all-targets --all-features --examples
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v1
+      - name: Install toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt
+      - name: Check formatting
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+  check:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v1
+      - name: Install toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: clippy
+      - name: Check style
+        uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all --all-targets --all-features -- -D warnings
+  miri:
+    name: Miri
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v1
+      - name: Install toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          override: true
+          components: miri
+      - name: Setup miri
+        uses: actions-rs/cargo@v1
+        with:
+          command: miri
+          args: setup
+      - name: Run tests under miri
+        uses: actions-rs/cargo@v1
+        with:
+          command: miri
+          args: test -- -- -Zunstable-options --exclude-should-panic

src/slice.rs

@@ -1,6 +1,6 @@
 use {
     crate::Thinnable,
-    alloc::{vec::Vec, boxed::Box},
+    alloc::{boxed::Box, vec::Vec},
     core::{
         cmp,
         ops::{Deref, DerefMut},