Add data structures used by redundant_clone

Author: Jarcho

.github/workflows/clippy_mq.yml

@@ -65,6 +65,10 @@ jobs:
       if: matrix.host != 'x86_64-unknown-linux-gnu'
       run: cargo test --features internal -- --skip dogfood
 
+    - name: Test clippy_data_structures
+      run: cargo test
+      working-directory: clippy_data_structures
+
     - name: Test clippy_lints
       run: cargo test
       working-directory: clippy_lints

.github/workflows/clippy_pr.yml

@@ -41,6 +41,10 @@ jobs:
     - name: Test
       run: cargo test --features internal
 
+    - name: Test clippy_data_structures
+      run: cargo test
+      working-directory: clippy_data_structures
+
     - name: Test clippy_lints
       run: cargo test
       working-directory: clippy_lints

clippy_data_structures/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "clippy_data_structures"
+version = "0.0.1"
+edition = "2021"
+
+[dependencies]
+arrayvec = { version = "0.7", default-features = false}
+smallvec = { version = "1.8.1", features = ["union", "may_dangle", "const_new"] }
+
+[package.metadata.rust-analyzer]
+# This package uses #[feature(rustc_private)]
+rustc_private = true