Basic repl

.github/workflows/rust.yml

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+name: Rust
+
+on:
+  push:
+    branches: [ "main", "master" ]
+  pull_request:
+    branches: [ "main", "master" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    
+    - name: Build
+      run: cargo build --verbose
+      
+    - name: Run tests
+      run: cargo test --verbose
+      
+    - name: Check formatting
+      run: cargo fmt -- --check
+      
+    - name: Clippy
+      run: cargo clippy -- -D warnings