Created shell

.github/workflows/lean_action_ci.yml

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+name: Lean Action CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v5
+      - uses: leanprover/lean-action@v1

.gitignore

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+/.lake

Main.lean

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+import ShellWall
+
+def main : IO Unit :=
+  IO.println s!"Hello, {hello}!"

ShellWall.lean

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+-- This module serves as the root of the `ShellWall` library.
+-- Import modules here that should be built as part of the library.
+import ShellWall.Basic

ShellWall/Basic.lean

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+def hello := "world"

lake-manifest.json

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+{"version": "1.1.0",
+ "packagesDir": ".lake/packages",
+ "packages": [],
+ "name": "ShellWall",
+ "lakeDir": ".lake"}

lakefile.toml

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+name = "ShellWall"
+version = "0.1.0"
+defaultTargets = ["shellwall"]
+
+[[lean_lib]]
+name = "ShellWall"
+
+[[lean_exe]]
+name = "shellwall"
+root = "Main"

lean-toolchain

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+leanprover/lean4:v4.29.1